DAP 100% Silicone Rubber Window, Door & Siding Sealant is a durable, 100% waterproof and weatherproof, all-purpose sealant for sealing out drafts, water and moisture around windows, doors, siding, gutters, flashing, pipes, vents and more. It stays flexible to withstand expansion and contraction without cracking or losing adhesion. Cured sealant is mold and mildew resistant. Interior/exterior use