This is a RM801/QT Metal Conditioner. A metal etching, acid type of cleaner which leaves an adherent phosphate coating. For use on bare steel & aluminum to clean & mildly etch the metal prior to priming. Improves adhesion & minimizes rust creepage resulting in a more durable finish. It is used to neutralize soldering flux, remove light rust, promote adhesion of subsequent coatings & is non-flammable.