{"id":1494,"date":"2019-10-24T10:38:46","date_gmt":"2019-10-24T10:38:46","guid":{"rendered":"https:\/\/penosil.com\/us\/?page_id=1494"},"modified":"2025-07-30T11:37:04","modified_gmt":"2025-07-30T11:37:04","slug":"frequently-asked-questions","status":"publish","type":"page","link":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/","title":{"rendered":"Frequently asked questions"},"content":{"rendered":"\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1753875249779\"><strong class=\"schema-faq-question\">Are the silicone sealants UV resistant?<\/strong> <p class=\"schema-faq-answer\">Yes, the silicones are considered to have the best UV-resistance amongst the main type of sealants available on the market today.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1753875262997\"><strong class=\"schema-faq-question\">Does PENOSIL offer white silicone that does not turn yellow?<\/strong> <p class=\"schema-faq-answer\">The discoloration of sealants happens mainly due to the contact of adjacent materials (migration), chemical vapours and fluids. Since in real life applications it is almost impossible to avoid the contact with different vapours and fluids, there is always a risk for discoloration of the sealant. In general, the acetoxy silicones and the acrylic sealants are less sensitive to yellowing when in contact with chemical vapours and fluids, compared to neutral silicones.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1753875274387\"><strong class=\"schema-faq-question\">What is the lifetime of a sealed joint?<\/strong> <p class=\"schema-faq-answer\">It is difficult to predict the lifetime of the sealed joints, since it depends on many variables that are out of our control. Application conditions, installation techniques, exploitation conditions after curing \u2013 these are just some of the important variables that determine the lifetime of a sealant joint. In order to ensure the longevity of the sealed joints the sealants should be applied and maintained regularly according to the guidelines listed in our\u00a0<a href=\"https:\/\/penosil.com\/us\/knowledge-centre\/product-know-how\/\" target=\"_blank\" rel=\"noreferrer noopener\">manuals<\/a><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1753875280071\"><strong class=\"schema-faq-question\">Are all silicones overpaintable?<\/strong> <p class=\"schema-faq-answer\">No, the silicone sealants are not overpaintable, since the paint does not adhere to the silicone surface. Among sealants, the overpaintable products are typically acrylic sealants, hybrid sealants and polyurethane (PU) sealants. The hybrid and polyurethane technologies can be painted over only with water-based products and we always recommend preliminary test, prior to the actual application.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1753875287407\"><strong class=\"schema-faq-question\">Are the foams UV-resistant?<\/strong> <p class=\"schema-faq-answer\">No, the foams are not UV-resistant and they need to be covered with suitable opaque sealant, filler, paint or other material.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1753875309875\"><strong class=\"schema-faq-question\">Can I use the foam outdoor?<\/strong> <p class=\"schema-faq-answer\">Yes, the foam can be used outdoor, but it must be protected from weather conditions.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1753875316595\"><strong class=\"schema-faq-question\">For how long can I leave the foam uncovered?<\/strong> <p class=\"schema-faq-answer\">We recommend to cover the foam within a few days after curing to prevent damage by UV-light and sunlight.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1753875329281\"><strong class=\"schema-faq-question\">Is the PENOSIL Premium Fire Block Gun Foam 121 foam fire resistant?<\/strong> <p class=\"schema-faq-answer\">Yes, please check the TDS or the product package for further information.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1753875337773\"><strong class=\"schema-faq-question\">Can I clean hardened polyurethane foam on the metal doors?<\/strong> <p class=\"schema-faq-answer\">Yes, the cured foam can be cleaned mechanically with a scraper.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1753875344407\"><strong class=\"schema-faq-question\">What foamgun should I use with PENOSIL products?<\/strong> <p class=\"schema-faq-answer\">With PENOSIL foams it is recommended to use\u00a0<a href=\"https:\/\/penosil.com\/us\/products\/product-groups\/tools-accessories\/\">Penosil foamguns<\/a>\u00a0which are specially developed to ensure best foam application results.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1753875349722\"><strong class=\"schema-faq-question\">How to properly cut hardened foam?<\/strong> <p class=\"schema-faq-answer\">Make sure the foam is fully cured. Use a sharp knife for best results.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1753875356039\"><strong class=\"schema-faq-question\">Do I need to moisten the substrates before applying the foam?<\/strong> <p class=\"schema-faq-answer\">We recommended to moisten the dry substrates to ensure better results. Slightly spray the substrate with water and make sure there are no water droplets on the surface before applying the foam. Do not spray substrates with water in\u00a0temperature below 32\u00b0F, as the water may freeze and worsen adhesion.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1753875363629\"><strong class=\"schema-faq-question\">How to use construction foam in freezing temperature?<\/strong> <p class=\"schema-faq-answer\">PENOSIL product range offers special foams to use in temperature below 32\u00b0F. First, choose the suitable product that covers necessary application temperature range. Notice that\u00a0 the foam can temperature must be above 41\u00b0F and in some cases even higher, please check the TDS or product package for more information. It is recommended to warm the foam can with water or air (max. 86\u00b0F) before starting work in low temperatures.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1753875367759\"><strong class=\"schema-faq-question\">How to use foam to prevent the door frames from deforming?<\/strong> <p class=\"schema-faq-answer\">Always use supports to secure the door frames. We recommend to use low expansion foams to avoid deformation of the door frames. Usually the gunfoams provide lower expansion than the strawfoams.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1753875375136\"><strong class=\"schema-faq-question\">Is it possible to overpaint the foam?<\/strong> <p class=\"schema-faq-answer\">Yes.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1753875379957\"><strong class=\"schema-faq-question\">Which cleaner to choose for foam?<\/strong> <p class=\"schema-faq-answer\">Uncured foam can be cleaned using PENOSIL Premium Foam Cleaner. Cured foam can be removed mechanically.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1753875395487\"><strong class=\"schema-faq-question\">How to use cleaners?<\/strong> <p class=\"schema-faq-answer\">PENOSIL Premium Foam Cleaner can be used to clean uncured PU foam from surfaces. The Foam Cleaner can also be used for cleaning the foamgun after the foam application. For cleaning the foamgun, screw the canister on the gun and press the gun trigger. Please refer to the TDS or the product package for more information.<\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":27,"menu_order":187,"comment_status":"closed","ping_status":"closed","template":"page-templates\/template-faq.php","meta":{"_acf_changed":false,"advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":"","footnotes":""},"class_list":["post-1494","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Frequently Asked Questions - PENOSIL Global<\/title>\n<meta name=\"description\" content=\"Welcome to our Frequently Asked Questions (FAQs) where you can find expert tips and answers to your PENOSIL product related questions.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Frequently Asked Questions - PENOSIL Global\" \/>\n<meta property=\"og:description\" content=\"Welcome to our Frequently Asked Questions (FAQs) where you can find expert tips and answers to your PENOSIL product related questions.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/\" \/>\n<meta property=\"og:site_name\" content=\"Penosil United States\" \/>\n<meta property=\"article:modified_time\" content=\"2025-07-30T11:37:04+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<script type=\"application\/ld+json\" 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resistant?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, the silicones are considered to have the best UV-resistance amongst the main type of sealants available on the market today.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875262997\",\"position\":2,\"url\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875262997\",\"name\":\"Does PENOSIL offer white silicone that does not turn yellow?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The discoloration of sealants happens mainly due to the contact of adjacent materials (migration), chemical vapours and fluids. Since in real life applications it is almost impossible to avoid the contact with different vapours and fluids, there is always a risk for discoloration of the sealant. In general, the acetoxy silicones and the acrylic sealants are less sensitive to yellowing when in contact with chemical vapours and fluids, compared to neutral silicones.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875274387\",\"position\":3,\"url\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875274387\",\"name\":\"What is the lifetime of a sealed joint?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It is difficult to predict the lifetime of the sealed joints, since it depends on many variables that are out of our control. Application conditions, installation techniques, exploitation conditions after curing \u2013 these are just some of the important variables that determine the lifetime of a sealant joint. In order to ensure the longevity of the sealed joints the sealants should be applied and maintained regularly according to the guidelines listed in our\u00a0<a href=\\\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/product-know-how\\\/\\\" target=\\\"_blank\\\" rel=\\\"noreferrer noopener\\\">manuals<\\\/a>\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875280071\",\"position\":4,\"url\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875280071\",\"name\":\"Are all silicones overpaintable?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, the silicone sealants are not overpaintable, since the paint does not adhere to the silicone surface. Among sealants, the overpaintable products are typically acrylic sealants, hybrid sealants and polyurethane (PU) sealants. The hybrid and polyurethane technologies can be painted over only with water-based products and we always recommend preliminary test, prior to the actual application.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875287407\",\"position\":5,\"url\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875287407\",\"name\":\"Are the foams UV-resistant?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, the foams are not UV-resistant and they need to be covered with suitable opaque sealant, filler, paint or other material.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875309875\",\"position\":6,\"url\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875309875\",\"name\":\"Can I use the foam outdoor?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, the foam can be used outdoor, but it must be protected from weather conditions.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875316595\",\"position\":7,\"url\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875316595\",\"name\":\"For how long can I leave the foam uncovered?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"We recommend to cover the foam within a few days after curing to prevent damage by UV-light and sunlight.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875329281\",\"position\":8,\"url\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875329281\",\"name\":\"Is the PENOSIL Premium Fire Block Gun Foam 121 foam fire resistant?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, please check the TDS or the product package for further information.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875337773\",\"position\":9,\"url\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875337773\",\"name\":\"Can I clean hardened polyurethane foam on the metal doors?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, the cured foam can be cleaned mechanically with a scraper.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875344407\",\"position\":10,\"url\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875344407\",\"name\":\"What foamgun should I use with PENOSIL products?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"With PENOSIL foams it is recommended to use\u00a0<a href=\\\"https:\\\/\\\/penosil.com\\\/us\\\/products\\\/product-groups\\\/tools-accessories\\\/\\\">Penosil foamguns<\\\/a>\u00a0which are specially developed to ensure best foam application results.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875349722\",\"position\":11,\"url\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875349722\",\"name\":\"How to properly cut hardened foam?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Make sure the foam is fully cured. Use a sharp knife for best results.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875356039\",\"position\":12,\"url\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875356039\",\"name\":\"Do I need to moisten the substrates before applying the foam?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"We recommended to moisten the dry substrates to ensure better results. Slightly spray the substrate with water and make sure there are no water droplets on the surface before applying the foam. Do not spray substrates with water in\u00a0temperature below 32\u00b0F, as the water may freeze and worsen adhesion.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875363629\",\"position\":13,\"url\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875363629\",\"name\":\"How to use construction foam in freezing temperature?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"PENOSIL product range offers special foams to use in temperature below 32\u00b0F. First, choose the suitable product that covers necessary application temperature range. Notice that\u00a0 the foam can temperature must be above 41\u00b0F and in some cases even higher, please check the TDS or product package for more information. It is recommended to warm the foam can with water or air (max. 86\u00b0F) before starting work in low temperatures.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875367759\",\"position\":14,\"url\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875367759\",\"name\":\"How to use foam to prevent the door frames from deforming?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Always use supports to secure the door frames. We recommend to use low expansion foams to avoid deformation of the door frames. Usually the gunfoams provide lower expansion than the strawfoams.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875375136\",\"position\":15,\"url\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875375136\",\"name\":\"Is it possible to overpaint the foam?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875379957\",\"position\":16,\"url\":\"https:\\\/\\\/penosil.com\\\/us\\\/knowledge-centre\\\/frequently-asked-questions\\\/#faq-question-1753875379957\",\"name\":\"Which cleaner to choose for foam?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Uncured foam can be cleaned using PENOSIL Premium Foam Cleaner. 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PENOSIL Global","isPartOf":{"@id":"https:\/\/penosil.com\/us\/#website"},"datePublished":"2019-10-24T10:38:46+00:00","dateModified":"2025-07-30T11:37:04+00:00","description":"Welcome to our Frequently Asked Questions (FAQs) where you can find expert tips and answers to your PENOSIL product related questions.","breadcrumb":{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#breadcrumb"},"mainEntity":[{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875249779"},{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875262997"},{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875274387"},{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875280071"},{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875287407"},{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875309875"},{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875316595"},{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875329281"},{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875337773"},{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875344407"},{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875349722"},{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875356039"},{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875363629"},{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875367759"},{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875375136"},{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875379957"},{"@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875395487"}],"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/penosil.com\/us\/"},{"@type":"ListItem","position":2,"name":"Knowledge centre","item":"https:\/\/penosil.com\/us\/knowledge-centre\/"},{"@type":"ListItem","position":3,"name":"Frequently asked questions"}]},{"@type":"WebSite","@id":"https:\/\/penosil.com\/us\/#website","url":"https:\/\/penosil.com\/us\/","name":"Penosil United States","description":"","publisher":{"@id":"https:\/\/penosil.com\/us\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/penosil.com\/us\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/penosil.com\/us\/#organization","name":"Penosil United States","url":"https:\/\/penosil.com\/us\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/penosil.com\/us\/#\/schema\/logo\/image\/","url":"https:\/\/penosil.com\/us\/wp-content\/uploads\/sites\/37\/2019\/07\/penosil-logo.svg","contentUrl":"https:\/\/penosil.com\/us\/wp-content\/uploads\/sites\/37\/2019\/07\/penosil-logo.svg","width":125,"height":21,"caption":"Penosil United States"},"image":{"@id":"https:\/\/penosil.com\/us\/#\/schema\/logo\/image\/"}},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875249779","position":1,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875249779","name":"Are the silicone sealants UV resistant?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes, the silicones are considered to have the best UV-resistance amongst the main type of sealants available on the market today.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875262997","position":2,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875262997","name":"Does PENOSIL offer white silicone that does not turn yellow?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"The discoloration of sealants happens mainly due to the contact of adjacent materials (migration), chemical vapours and fluids. Since in real life applications it is almost impossible to avoid the contact with different vapours and fluids, there is always a risk for discoloration of the sealant. In general, the acetoxy silicones and the acrylic sealants are less sensitive to yellowing when in contact with chemical vapours and fluids, compared to neutral silicones.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875274387","position":3,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875274387","name":"What is the lifetime of a sealed joint?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"It is difficult to predict the lifetime of the sealed joints, since it depends on many variables that are out of our control. Application conditions, installation techniques, exploitation conditions after curing \u2013 these are just some of the important variables that determine the lifetime of a sealant joint. In order to ensure the longevity of the sealed joints the sealants should be applied and maintained regularly according to the guidelines listed in our\u00a0<a href=\"https:\/\/penosil.com\/us\/knowledge-centre\/product-know-how\/\" target=\"_blank\" rel=\"noreferrer noopener\">manuals<\/a>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875280071","position":4,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875280071","name":"Are all silicones overpaintable?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"No, the silicone sealants are not overpaintable, since the paint does not adhere to the silicone surface. Among sealants, the overpaintable products are typically acrylic sealants, hybrid sealants and polyurethane (PU) sealants. The hybrid and polyurethane technologies can be painted over only with water-based products and we always recommend preliminary test, prior to the actual application.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875287407","position":5,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875287407","name":"Are the foams UV-resistant?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"No, the foams are not UV-resistant and they need to be covered with suitable opaque sealant, filler, paint or other material.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875309875","position":6,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875309875","name":"Can I use the foam outdoor?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes, the foam can be used outdoor, but it must be protected from weather conditions.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875316595","position":7,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875316595","name":"For how long can I leave the foam uncovered?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"We recommend to cover the foam within a few days after curing to prevent damage by UV-light and sunlight.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875329281","position":8,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875329281","name":"Is the PENOSIL Premium Fire Block Gun Foam 121 foam fire resistant?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes, please check the TDS or the product package for further information.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875337773","position":9,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875337773","name":"Can I clean hardened polyurethane foam on the metal doors?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes, the cured foam can be cleaned mechanically with a scraper.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875344407","position":10,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875344407","name":"What foamgun should I use with PENOSIL products?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"With PENOSIL foams it is recommended to use\u00a0<a href=\"https:\/\/penosil.com\/us\/products\/product-groups\/tools-accessories\/\">Penosil foamguns<\/a>\u00a0which are specially developed to ensure best foam application results.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875349722","position":11,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875349722","name":"How to properly cut hardened foam?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Make sure the foam is fully cured. Use a sharp knife for best results.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875356039","position":12,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875356039","name":"Do I need to moisten the substrates before applying the foam?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"We recommended to moisten the dry substrates to ensure better results. Slightly spray the substrate with water and make sure there are no water droplets on the surface before applying the foam. Do not spray substrates with water in\u00a0temperature below 32\u00b0F, as the water may freeze and worsen adhesion.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875363629","position":13,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875363629","name":"How to use construction foam in freezing temperature?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"PENOSIL product range offers special foams to use in temperature below 32\u00b0F. First, choose the suitable product that covers necessary application temperature range. Notice that\u00a0 the foam can temperature must be above 41\u00b0F and in some cases even higher, please check the TDS or product package for more information. It is recommended to warm the foam can with water or air (max. 86\u00b0F) before starting work in low temperatures.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875367759","position":14,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875367759","name":"How to use foam to prevent the door frames from deforming?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Always use supports to secure the door frames. We recommend to use low expansion foams to avoid deformation of the door frames. Usually the gunfoams provide lower expansion than the strawfoams.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875375136","position":15,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875375136","name":"Is it possible to overpaint the foam?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875379957","position":16,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875379957","name":"Which cleaner to choose for foam?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Uncured foam can be cleaned using PENOSIL Premium Foam Cleaner. Cured foam can be removed mechanically.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875395487","position":17,"url":"https:\/\/penosil.com\/us\/knowledge-centre\/frequently-asked-questions\/#faq-question-1753875395487","name":"How to use cleaners?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"PENOSIL Premium Foam Cleaner can be used to clean uncured PU foam from surfaces. The Foam Cleaner can also be used for cleaning the foamgun after the foam application. For cleaning the foamgun, screw the canister on the gun and press the gun trigger. Please refer to the TDS or the product package for more information.","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"coauthors":[],"author_meta":{"author_link":"https:\/\/penosil.com\/us\/author\/reaktiiv-pe\/","display_name":"reaktiiv-pe"},"relative_dates":{"created":"Posted 7 years ago","modified":"Updated 1 year ago"},"absolute_dates":{"created":"Posted on October 24, 2019","modified":"Updated on July 30, 2025"},"absolute_dates_time":{"created":"Posted on October 24, 2019 10:38 am","modified":"Updated on July 30, 2025 11:37 am"},"featured_img_caption":"","featured_img":false,"series_order":"","_links":{"self":[{"href":"https:\/\/penosil.com\/us\/wp-json\/wp\/v2\/pages\/1494","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/penosil.com\/us\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/penosil.com\/us\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/penosil.com\/us\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/penosil.com\/us\/wp-json\/wp\/v2\/comments?post=1494"}],"version-history":[{"count":2,"href":"https:\/\/penosil.com\/us\/wp-json\/wp\/v2\/pages\/1494\/revisions"}],"predecessor-version":[{"id":32268,"href":"https:\/\/penosil.com\/us\/wp-json\/wp\/v2\/pages\/1494\/revisions\/32268"}],"up":[{"embeddable":true,"href":"https:\/\/penosil.com\/us\/wp-json\/wp\/v2\/pages\/27"}],"wp:attachment":[{"href":"https:\/\/penosil.com\/us\/wp-json\/wp\/v2\/media?parent=1494"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}