From the #1 Silicone Brand, All Purpose Silicone 1 sealant is a 100% silicone and 100% weatherproof sealant ideal for areas that could be exposed to weather. These areas include windows, doors, siding and trim, as well as molding, baseboards, vents, around wires and pipes and attic or basement applications. Its same-day rain-ready formula is extremely flexible with strong adhesion and resistant to stain-causing mold and mildew growth with 7-year mold-free product protection. Backed by a lifetime guarantee.