CRC Rust Protection Black Zinc are quick drying, primer less topcoats, reinforced with zinc complexes for added corrosion control. Will outlast standard decorative paints by resisting undercutting and blistering from corrosion. The zinc content assists adhesion to bare metals. Recommended as a top coat for added corrosion control. Dries to deep rich finish. Final finish is both scratch and solvent resistant. Optimum level of zinc complexes give outstanding protection over bare metal. Does not require undercoat. Unique resin system bonds strongly to most metals.