Frequently asked questions

Yes, the silicones are considered to have the best UV-resistance amongst the main type of sealants available on the market today.

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.

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 – 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 manuals

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.

No, the foams are not UV-resistant and they need to be covered with suitable opaque sealant, filler, paint or other material.

Yes, the foam can be used outdoor, but it must be protected from weather conditions.

We recommend to cover the foam within a few days after curing to prevent damage by UV-light and sunlight.

Yes, please check the TDS or the product package for further information.

Yes, the cured foam can be cleaned mechanically with a scraper.

With PENOSIL foams it is recommended to use Penosil foamguns which are specially developed to ensure best foam application results.

Make sure the foam is fully cured. Use a sharp knife for best results.

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 temperature below 32°F, as the water may freeze and worsen adhesion.

PENOSIL product range offers special foams to use in temperature below 32°F. First, choose the suitable product that covers necessary application temperature range. Notice that  the foam can temperature must be above 41°F 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°F) before starting work in low temperatures.

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.

Yes.

Uncured foam can be cleaned using PENOSIL Premium Foam Cleaner. Cured foam can be removed mechanically.

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.