Rust-Oleum Stops Rust finishes are durable, tough, excellent hiding air dry finishes for interior or exterior protection of most metal, wood, or masonry surfaces. Rust-Oleum coatings resist weathering, salt air, moisture, mild chemicals, and industrial fumes. Prime metal surfaces with Rusty Metal Primer or White Clean Metal Primer. Rust-Oleum finishes cover up to 400 Sq. Ft. per gallon, dries to touch in 2 to 6 hours and to recoat after 24 hours. They may be applied with brush, roller, or spray. Thin sparingly for spray. If thinning is required, use paint thinner or mineral spirits. Clean up with paint thinner or mineral spirits. Gloss sheen except where specified. Available in flat, semi-gloss or satin.