PHOSTEK DR is a fast acting, acid type compound that neutralizes alkaline residue. It not only rapidly removes rust and stops rust action, but it also contains detergents designed to remove soils, drilling mud, salt water residues and all rust stains. It not only rapidly removes rust and stops rust action, but it will change rust (iron oxide) into iron phosphate, an inert, hard, usually gray surface that provides a perfect base for most paints. Available in 5 gallon pails, 55 gallon drums and bulk quantities.