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Premium silicone rubber window and door sealant. 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. Low in odor. Meets ASTM Specification C 920, Class 25, Type S, Grade NS. Lifetime guarantee. 10.1 fl. oz. cartridge.