From the #1 Silicone Brand, Advanced Silicone 2 Window & Door sealant (GE500) is a high-performance, 100% silicone and 100% weatherproof sealant ideal for protecting areas susceptible to harsh weather. Common uses include windows, doors, siding, trim, molding, baseboards, vents, basements, attics and around wires and pipes.Its 30-minute rain-ready formula offers 40% more flexibility than Class 25 sealants and is 5X stronger than Silicone 1* sealant. In addition, it has 10-year mold-free product protection to help the cured sealant resist mold and mildew growth. Backed by a lifetime guarantee.