Henry� 880 Tropi-Cool� Stop Leak� 100% Silicone Spray Sealer is a premium, easy-to-use, 100% silicone aerosol leak sealer formulated to provide a permanent leak-proof seal on a variety of surfaces. This waterproof silicone sealant protects gutters, skylights, flashing, roofs, RVs, campers, windowsills, foundations, boats, cars, concrete, glass, metal, and more. It also doubles up as a roof sealant to prevent any water leakage. This Tropi-Cool leak sealer spray is highly efficient and durable.