Permatex Form-A-Gasket #1 Sealant is a fast-drying, hard-setting sealant designed for sealing rigid materials and flanges, or patching holes and joints where permanent assembly is desired. Resists common shop fluids and fuels, with a temperature range of -65 degrees Fahrenheit to 400 degrees Fahrenheit. When a chemical gasket is not an option, Permatex offers a wide range of gasket sealants suitable for applications on both import and domestic vehicles of any model year or performance caliber.