DAP Dynaflex Ultra Advanced Sealant for Window, Door, Siding & Trim applications is formulated with innovative Weather Max Technology to resist UV fading, chalking, crumbling, cracking and dirt build up. It also has a lifetime mold, mildew and algae resistance guarantee, so the sealant stays looking clean and new. Dynaflex Ultra has strong adhesion to common building materials and stays permanently flexible for a long-lasting, weatherproof seal that provides All Weather Protection and stands up to the elements. It is rain ready and paintable in only one hour for better productivity. Does not bubble. The sealant guns out effortlessly and tools smoothly for easy application.