ATCO's RUSTAME II Rust Converter is a liquid surface conditioner and primer that converts existing rust into an inert, protective coating that seals out moisture and corrosion to prevent future development. Unlike other products, it is not a simple cleaner or cover-up. RUSTAME II's special formula attacks rust at the chemical level, for fast, long-lasting results. Treated surfaces turn matte black and can be painted with an oil-based paint for even longer protection against new rust.