RUST-OLEUM® Stops Rust® universal bonding primer is a fast dry, maximum adhesion primer that firmly bonds any topcoat to difficult-to-paint surfaces, including two-part epoxies. It may be used on interior or exterior surfaces to include galvanized steel, wrought iron railings, furniture, aluminum flashings, PVC, porcelain, masonry, glazed brick, metal, wood, fiberglass and other surfaces. Stops Rust® universal bonding primer features an advanced spray system that allows you to spray at any angle, even upside down for those hard-to reach areas. A comfort spray tip with a wider finger pad reduces fatigue caused by continuous spraying.