Hammerite Rust Cap smooth enamel finish is a self-priming, rust preventive coating designed to provide long-lasting metal protection. It provides a decorative finish that resists corrosion and the damaging effects from moisture and severe weather and is formulated for interior and exterior use. For use on metal substratesCan be applied directly over firm, rusty surfacesFor previously painted surfaces, apply Hammerite Rust Cap Smooth Enamel Finish to a small area first to check adhesion and test for lifting or crackingSmooth Bright Yellow brush grade enamel finish 1 quart