Permatex Form-A-Gasket #1 Sealant is a fast-drying, hard-setting sealant designed for sealing rigid materials and flanges where permanent assembly is desired. A reliable paste-like gasket sealant/dressing/coating that sets quickly. Good for -65 to 400 degrees Fahrenheit. Resistant to gasoline and other solvents. Conforms to MIL-S-45180 D, Type I. 1.5 oz tube.