RPM - Rust Prevention Magic - 8 oz. Includes FREE Application Brush! Used on Metals including cast-iron, stamped steel, aluminum, etc.to protect against Acids, Saltwater, Moisture, Oxidation, and Rust. 8 ounces allows for covering of all your vehicle's Bare Metal with some left over for re-application! Dries to the touch to keep metal parts looking brand new! RPM does not leave behind an oily residue and does not attract dirt. Award Winning Rust Prevention Product, With Enough to Cover All of Your Vehicle's Bare Metal Parts.