Rust-Oleum® Stops Rust Rust Reformer Spray, Black, 10.25 oz Aerosol Can, 6/Carton (RST215215) Case of 6Rust Oleum Stops Rust Rust Reformer converts rust into a non rusting paintable surface. Rust Reformer eliminates the need to sand bare metal and creates a smooth, flat black coating with excellent rust and corrosion resistance. Spray directly onto rust or rusty metal surfaces for indoor or outdoor use. Oil based formula provides Stops Rust protection and dries fast. Apply one coat and allow 24 hours before top coat.