The Original Permatex Blue. Will Not Foul Oxygen Sensors. Replaces Almost Any Cut Gasket. Makes Reliable “Formed-In-Place” Gaskets That Resist Cracking, Shrinking And Migrating. Coats Pre-Cut Gaskets To Increase Reliability. Temperature Range -65 F To 500 F (-54 C To 260 C) Intermittent; Resists Auto And Shop Fluids. First Generation 1970-1980 Gasket Maker.