Rust-Oleum Stops Rust Automobile Primer provides a durable rust-inhibitive base for most automotive lacquers and enamels. For maximum protection, topcoat with a Rust-Oleum Stops Rust Enamel. If using an auto lacquer, a test application for compatibility is recommended. Stops Rust Automobile Primer features a comfort tip with a wider finger pad to reduce fatigue caused by continuous spraying and the any-angle tip, which allows you to spray at any angle. Automobile Primer is fast drying and sandable for bare or lightly rusted surfaces. Not for use on galvanized steel.