Henry 884 Tropi-Cool 100% silicone roof sealant is a high solids dispersion of 100% silicone. It offers excellent UV (ultraviolet) resistance and weathering characteristics with no hardening, chalking, crazing, or cracking, and is mold and mildew resistant. It also offers excellent adhesion to a wide variety of building materials. Features: Ponding water resistant, exceptionally versatile, tough and yet flexible, excellent adhesion, and vertical and horizontal applications. Wide application temperature range from 35 F (degrees Fahrenheit) to 120 F (2 Celsius to 49 C). Ready-to-use and easy to apply by caulking gun.