Rust Converter Aerosol is a surface conditioner and primer that converts existing rust into an inert, protective coating that seals out moisture and corrosion. Unlike other products, it is not a simple cleaner or cover-up. The special formula attacks rust at the chemical level, for fast, long-lasting results. Treated surfaces can be left as-is or painted with an oil-based paint for even longer protection against new rust. (12) 20oz. Cans.