Formulated to create a long-lasting watertight and weatherproof seal with superior flexibility and adhesion to a variety of building materials. When cured, it is mold and mildew-resistant and will not crack or shrink. Unlike acetoxy silicone sealants. This premium silicone rubber window and door sealant is low in odor. Meets ASTM Specification C 920, Class 25, Type S, Grade NS. 10\% more Bonus in 10.8 Oz. cartridge