Dowsil 791 is a one-part neutral silicone for weather sealing. It is used for both commercial and domestic applications, and provides excellent adhesion to most exterior substrates. It has excellent weathering characteristics, including resistance to ozone, UV radiation and temperature extremes. It has a 20 minutes skin over time and it is tack-free in 45 minutes. Conforms to ISO 11600-25LM and also meets ISO specification 9047 class 50. Dowsil 791T Silicone Sealant, Translucent