Smooth Finish. HAMMERITE Rust Cap paint is a self-priming, fast dry, rust preventive coating designed to provide both interior and exterior long-lasting metal protection. It provides a decorative finish that resists corrosion and the weather. HAMMERITE Rust Cap paint dries to the touch in 30 minute. Recoats should be applied within 4 hours, before curing begins. This versatile paint can be used for a variety of applications û from covering rust to painting lawn furniture, crafts, metal wagons and more. ItÆs terrific on iron, steel and most metal surfaces. Glassguard Protection: As the HAMMERITE Rust Cap coating dries, millions of heat-hardened glass flakes interlock with special resins, forming a super-tough barrier that seals out moisture to prevent rusting. Paint Right Over the Rust: HAMMERITE Rust Cap paint is a long-lasting coating that can be applied directly over firm, rusty surfaces. With HAMMERITEÆS unique paint-right-over-the-rust capability, you achieve a smooth, deep finish, rich in color. ItÆs terrific on iron, steel and most metal surfaces. HAMMERITE Rust Cap Smooth Metal Finish provides a high gloss finish.