{"id":30558,"date":"2026-04-20T12:37:45","date_gmt":"2026-04-20T12:37:45","guid":{"rendered":"https:\/\/penosil.com\/uk\/?p=30558"},"modified":"2026-04-20T12:37:46","modified_gmt":"2026-04-20T12:37:46","slug":"how-to-use-pu-gun-foam-like-a-true-professional","status":"publish","type":"post","link":"https:\/\/penosil.com\/uk\/how-to-use-pu-gun-foam-like-a-true-professional\/","title":{"rendered":"How to Use PU Gun Foam Like a True Professional"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Getting the maximum yield and efficiency out of polyurethane (PU) gun foam involves much more than simply pointing and pressing a foam gun trigger. Whether you are sealing penetrations in a new build or insulating a renovation project, the quality of your products and application methods directly impacts the building\u2019s long-term energy efficiency. <strong>Below are a few tips for mastering PU gun foams.<\/strong><br><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. Quality Matters<\/strong><br><strong>PU Foam:<\/strong> First and foremost, quality matters. A good-quality foam has fine cells and uniform structure, therefore ensuring better insulating properties.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Foam Gun: <\/strong>Foam gun quality greatly affects foam yield and structure. High-quality guns such as <strong><u><a href=\"https:\/\/penosil.com\/uk\/product\/pu-foam-gun-penosil-foamgun-s1\/\" target=\"_blank\" rel=\"noreferrer noopener\">Penosil FoamGun S1<\/a><\/u><\/strong> allow for more precise dosing, help to get the maximum output from the can and ensure better foam structure.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"377\" src=\"https:\/\/penosil.com\/uk\/wp-content\/uploads\/sites\/17\/2023\/08\/PENOSIL_FoamGun_S1_2017-700x377.jpg\" alt=\"Professional PU Foam Gun Penosil FoamGun S1 product image\" class=\"wp-image-26908\" style=\"aspect-ratio:1.8568535716779555;width:305px;height:auto\" srcset=\"https:\/\/penosil.com\/uk\/wp-content\/uploads\/sites\/17\/2023\/08\/PENOSIL_FoamGun_S1_2017-700x377.jpg 700w, https:\/\/penosil.com\/uk\/wp-content\/uploads\/sites\/17\/2023\/08\/PENOSIL_FoamGun_S1_2017-250x135.jpg 250w, https:\/\/penosil.com\/uk\/wp-content\/uploads\/sites\/17\/2023\/08\/PENOSIL_FoamGun_S1_2017-768x414.jpg 768w, https:\/\/penosil.com\/uk\/wp-content\/uploads\/sites\/17\/2023\/08\/PENOSIL_FoamGun_S1_2017-1536x828.jpg 1536w, https:\/\/penosil.com\/uk\/wp-content\/uploads\/sites\/17\/2023\/08\/PENOSIL_FoamGun_S1_2017-2048x1104.jpg 2048w, https:\/\/penosil.com\/uk\/wp-content\/uploads\/sites\/17\/2023\/08\/PENOSIL_FoamGun_S1_2017-120x65.jpg 120w, https:\/\/penosil.com\/uk\/wp-content\/uploads\/sites\/17\/2023\/08\/PENOSIL_FoamGun_S1_2017-180x97.jpg 180w, https:\/\/penosil.com\/uk\/wp-content\/uploads\/sites\/17\/2023\/08\/PENOSIL_FoamGun_S1_2017-600x323.jpg 600w, https:\/\/penosil.com\/uk\/wp-content\/uploads\/sites\/17\/2023\/08\/PENOSIL_FoamGun_S1_2017-300x162.jpg 300w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"wp-block-paragraph\">For extra-narrow and deep joints such as those between insulation boards, we recommend using <strong>Penosil FoamGun F1<\/strong>. The gun\u2019s extra-narrow nozzle helps the foam to penetrate deep into the joints, improving the building\u2019s thermal and sound insulation. The smaller the nozzle, the denser the foam structure will be.<\/p>\n<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. Preparation<\/strong><br><strong>Surface Preparation:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Clean Well<\/strong>: Thoroughly cleaning the surfaces before starting work ensures maximum adhesion. Remove all traces of dust, grease, oil and loose particles.<\/li>\n\n\n\n<li><strong>Limit Cleaning Afterwards<\/strong>: Protect adjacent visible surfaces with masking tape or other protective material. Foam stains are notoriously difficult to remove once cured.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><br><strong>Working Temperature:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Temperature Matters<\/strong>: The temperature of the foam can greatly affects the PU foam\u2019s performance. For the best foam structure and maximum yield, your foam can should be at room temperature (around <strong>+20\u00b0C<\/strong>) during application. Cold foam yields less and has a poor cellular structure. Although Penosil portfolio includes many all-season foams, such as <strong><u><a href=\"https:\/\/penosil.com\/uk\/product\/window-foam-penosil-198\/\" target=\"_blank\" rel=\"noreferrer noopener\">Penosil Window &amp; Door Elastic Gunfoam 198<\/a><\/u><\/strong> (suitable for -5\u00b0C to +30\u00b0C), the best results will be achieved when the PU foam is at room temperature during application.<\/li>\n\n\n\n<li><strong>Pro Tip<\/strong>: If the can is cold, warm it gradually by leaving it in a warm room for a few hours or placing it upright in lukewarm (not hot) water. Never expose it to open flames or high heat, as the pressurised canister may explode.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><br><strong>3. Professional Application Techniques<\/strong><br><strong>Moistening and Shaking:<\/strong><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<ul class=\"wp-block-list\">\n<li><strong>Moisten Slightly<\/strong>: One-component PU foam needs moisture to expand and cure properly. Lightly mist the surfaces with water before application (only above 0\u00b0C). This simple step speeds up curing and creates a uniform foam structure. Aim for damp, not wet.<\/li>\n\n\n\n<li><strong>Shake Vigorously:<\/strong> Before attaching the can to the gun, shake it vigorously at least <strong>20 times<\/strong> to thoroughly mix the PU foam components. Do not skip this step!<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<figure class=\"wp-block-image size-large is-style-default\"><img decoding=\"async\" src=\"https:\/\/penosil.com\/wp-content\/uploads\/2026\/04\/DSC04078-700x467.jpg\" alt=\"Moistening the joint before foam application\" class=\"wp-image-37818\"\/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Safety First:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Gloves and Glasses<\/strong>: Always wear protective gloves and safety glasses when working with PU foam.<\/li>\n\n\n\n<li><strong>Avoid skin contact<\/strong>. If you do get uncured foam on your skin, remove it immediately either with <strong><strong><u><a href=\"https:\/\/penosil.com\/uk\/product\/industrial-cleaning-wipes-penosil-943\/\" target=\"_blank\" rel=\"noreferrer noopener\">Penosil Multipurpose Wipes 943<\/a><\/u><\/strong><\/strong>, solvent or by scraping it off.<\/li>\n\n\n\n<li><strong>What Not to Do<\/strong>: Do not screw the can to the gun with the valve upside down or bend the can during screwing. Do not aim the gun at people and never smoke during application.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><br><strong>Using the Gun Foam:<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/penosil.com\/wp-content\/uploads\/2026\/04\/Gunfoam-700x153.png\" alt=\"Gun foam usage instructions\" class=\"wp-image-37822\" style=\"width:744px;height:auto\"\/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Attaching the Gun to the Can<\/strong>: Hold the foam can upright and screw it onto the gun while holding the adapter in place with your fingers.<\/li>\n\n\n\n<li><strong>Initial Foam<\/strong>: Before starting to work, extrude a small amount of foam (<strong>1\u20132 seconds<\/strong>) into a waste bin to clear any air bubbles or residue from the gun.<\/li>\n\n\n\n<li><strong>Upside Down:<\/strong> Always hold the can upside down when working with PU foam. You can adjust the extrusion speed and volume with the gun trigger and adjustment screw.<\/li>\n\n\n\n<li><strong>Vertical Application:<\/strong> When filling vertical joints, always work from the <strong>bottom to the top<\/strong> in a <strong>zig-zag movement<\/strong>.<\/li>\n\n\n\n<li><strong>Don&#8217;t Overfill:<\/strong> PU foam expands; only fill the joints partially. Overfilling is wasteful and creates unnecessary cleanup. Depending on the foam formula, the joints should be filled between <strong>50 and 70%.<\/strong> Check the filling rate on the product&#8217;s label.<\/li>\n\n\n\n<li><strong>Larger Joints:<\/strong> When filling larger joints, apply the foam in multiple layers and moisten slightly between each layer.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><br><strong>Finishing:<\/strong><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<ul class=\"wp-block-list\">\n<li><strong>Curing and Cutting<\/strong>: Only cut excess foam once it is fully cured. Cutting too early can collapse the cell structure. Keep in mind that curing time depends heavily on air temperature, humidity and joint dimensions.<\/li>\n\n\n\n<li><strong>UV Protection:<\/strong> PU foam is not UV-resistant. To prevent the cured foam from degrading, cover it with paint, sealant, filler or other opaque material as soon as possible after curing.<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/penosil.com\/wp-content\/uploads\/2026\/04\/DSC04185-700x467.jpg\" alt=\"Cutting the excess PU foam\" class=\"wp-image-37824\"\/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><br><strong>4. Storage and Care<\/strong><br><strong>Care<\/strong><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<ul class=\"wp-block-list\">\n<li><strong>Leaving the Gun on the Can:<\/strong> If you plan to use the foam can again within a few days, leave it attached to the gun. Completely close the adjustment screw and clean the nozzle tip with <strong><u><a href=\"https:\/\/penosil.com\/uk\/product\/pu-foam-cleaner-penosil-foam-cleaner-929\/\" target=\"_blank\" rel=\"noreferrer noopener\">Penosil Foam Cleaner 929<\/a><\/u><\/strong> to prevent it from clogging.<\/li>\n\n\n\n<li><strong>Removing the Gun:<\/strong> If you are switching to a different foam or the can is empty, remove the gun. First, close the adjustment screw, then remove the can from the gun. Clean the outside of the gun using <strong><u><a href=\"https:\/\/penosil.com\/uk\/product\/pu-foam-cleaner-penosil-foam-cleaner-929\/\" target=\"_blank\" rel=\"noreferrer noopener\">Penosil Foam Cleaner 929<\/a><\/u><\/strong> spray nozzle and then attach the cleaner canister directly to the gun and spray until the liquid runs completely clear.<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/penosil.com\/wp-content\/uploads\/2026\/04\/929_Foam_Cleaner_929_UK.png\" alt=\"\" class=\"wp-image-37810\" style=\"aspect-ratio:0.3907513941237409;width:118px;height:auto\"\/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Storage:<\/strong> Always store foam cans in an <strong>upright position<\/strong> in a cool, dry place <strong>(+5\u00b0C to +30\u00b0C<\/strong>). As the foam cans are pressurised, never store them near heat sources, in direct sunlight, or at temperatures above 50\u00b0C.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Transport<\/strong>: When transporting the foam cans, keep them in an upright position and secure the cans before transport.<\/li>\n\n\n\n<li><strong>Best Before<\/strong>: Usually, a foam can&#8217;s guaranteed shelf life is 12 months; always check the expiry date before use.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><br>By combining the right professional tools with these tried-and-tested techniques, you&#8217;ll work cleaner, save money, and achieve a perfect seal every single time. Explore <strong><u><a href=\"https:\/\/penosil.com\/uk\/products\/product-groups\/pu-foams\/gun-foams\/\" target=\"_blank\" rel=\"noreferrer noopener\">Penosil range of PU gun foams<\/a><\/u><\/strong> and <strong><u><a href=\"https:\/\/penosil.com\/uk\/products\/product-groups\/pu-foams\/foam-guns-and-cleaners\/\" target=\"_blank\" rel=\"noreferrer noopener\">guns here<\/a><\/u><\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Want to learn more about PU foams? <strong>Check out our other articles on this topic:<\/strong><br><strong><u><a href=\"https:\/\/penosil.com\/uk\/pu-foams-for-flawless-windows\/\" target=\"_blank\" rel=\"noreferrer noopener\">How to choose a suitable PU foam for window installation?<\/a><\/u><\/strong><br><strong><u><a href=\"https:\/\/penosil.com\/uk\/when-and-how-to-use-fire-resistant-pu-foam\/\" target=\"_blank\" rel=\"noreferrer noopener\">When and How to Use Fire-Resistant PU Foam?<\/a><\/u><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"Getting the maximum yield and efficiency out of polyurethane (PU) gun foam involves much more than simply pointing and pressing a foam gun trigger. Whether you are sealing penetrations in a new build or insulating a renovation project, the quality of your products and application methods directly impacts the building\u2019s long-term energy efficiency. Below are [&hellip;]","protected":false},"author":466,"featured_media":30560,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-30558","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Use PU Gun Foam Like a True Professional - Penosil United Kingdom<\/title>\n<meta name=\"description\" content=\"Read here how to get the maximum yield and efficiency out of your polyurethane (PU) foam product. 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