Permatex 85420 Permashield Fuel Resistant Gasket Dressing and Flange Sealant is specially formulated for superior fluid resistance, withstanding extreme temperature changes without hardening. Ideal for high performance applications, it seals surface imperfections between metal parts and remains flexible at high temperatures. Suitable as a gasket maker or dressing, it allows repeated assembly and disassembly. It operates in temperatures ranging from -50 to 260 degree celsius, resisting gasoline, oil, ethanol, water and antifreeze.