A brush-on, wipe-off aluminum cleaner and paint preparer in one powerful, easy-to-apply formulation. Etches the metal, neutralizes hand marks, is smutless on alloy surfaces, removes oil and grease and will not burn. It provides a firm and lasting adhesion between aluminum alloys & paint. Dilute with 2 or 3 parts of water. Improved in early 1985, Metal Prep No. 79 is now even more active on the metal surface and offers superior performance.