Rust-Oleum Engine Enamel Spray Paint Flat Gray Primer creates a smooth finish and is formulated for use on automotive engines and other automotive surfaces which reach intermittent temperatures up to 600°F (315°C). Painting an engine has never been so easy, as Rustoleum Engine Paint is made to resist rust and corrosion with Rust-Oleum Stops Rust Technology. It also features a comfort spray tip with wider finger pad that reduces fatigue caused by continuous spraying; the perfect paint for any engine bay.