PT-355 Engine Enamel is a heat resistant enamel packaged in bulk or aerosol cans. It is intended for use over metal surfaces that can withstand temperatures of 500°F. Although some colors will darken at this temperature, the integrity of the coating will remain intact. The Engine Enamel can be applied over bare, scuffed, sanded, abrasive blasted, primed and previously painted surfaces and shows excellent protection.