Premium quality, 100% silicone rubber sealant that provides outstanding durability and flexibility for a long lasting waterproof seal that won't shrink or crack. This one-component, neutral-cure sealant is low in odor and cures to a tough rubbery solid upon exposure to moisture in the air. Provides outstanding adhesion to a wide variety of surfaces such as PVC, vinyl siding and painted wood. Cured sealant is mold and mildew resistant. Indoor / outdoor use. Backed by a Lifetime Guarantee. Meets ASTM C920 Specification, Class 25, Uses G, A and M.