DYNAFLEX ULTRA Advanced Exterior Sealant is powered by innovative Weather Max Technology for long-lasting, all weather protection. Provides exceptional UV resistance against color fading, yellowing, cracking, chalking and crumbling. Once cured, it resists mold, mildew and algae for the life of the sealant. Tough surface resists dirt build-up and water absorption for a durable, 100% waterproof seal that stands up to the elements. It has strong multi-material adhesion and stays permanently flexible to endure expansion and contraction caused by sun, heat, cold, wind and rain. Easy water clean up and low odor.