MAKES 16-GALLONS: Powerful Industrial quality Rust Remover designed to remove tough rust. Safe and easy-to-use Non-hazardous formulation. Rust911 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. Rust911 has an 5-year shelf life. On average, one gallon concentrate de-rusts up to 500 pounds of light to moderately rusted steel.