For Caulking And Sealing Around Windows And Doors, Gutters And Vents, Siding And Trim, And Molding. Adheres To Glass, Ceramic, Fiberglass, Porcelain, Non-Oily Woods, Canvas, Most Metals, Plastics And Rubbers And Painted Surfaces. Provides A Watertight, Flexible Seal That Won't Crack, Crumble Or Shrink. Once Cured, Its Unaffected By Temperature Extremes (Negative 40-Degrees To 400-Degrees Fahrenheit. Meets ASTM Specification C 920, Class 25, Type S, Grade NS.