EVAPO-RUST is an amazing award winning rust REMOVER which is utilized by the U.S. Army, U.S. Navy, U.S. Air Force, FBI, NATO, Government Contractors, Engine Builders, Auto Enthusiasts, Gunsmiths, Forensic Labs, OEMâs, Farmers, Antique Restorers and more. Evapo-Rust is a SOAK product and will remove rust from all types of metals containing iron. Evapo-Rust is NOT a spray-on and does not remove rust STAINS. Rust and rust stains are two different things. EVAPO-RUST is non-corrosive to steel and does not harm brass, copper, aluminum, gold, lead, titanium, steel, cast iron, chrome, solder points, vinyl, plastic, rubber, silicone, glass, cork, or wood. EVAPO-RUST has an indefinite shelf life* and can be used over and over until it absolutely stops working. On average, one gallon de-rusts up to 300 pounds of light to moderately rusted steel.