DAP DYNAFLEX ULTRA Advanced Exterior Sealant powered by WeatherMax Technology resists UV fading, chalking, crumbling, cracking and dirt build up, so the sealant stays looking clean and new. Permanently flexible with strong adhesion for a long-lasting, weatherproof seal that stands up to the elements and provides All Weather Protection. Easy application with one hour rain and paint ready times for better productivity. Provides lifetime, mold, mildew and algae resistance.