Evapo-Rust is a water-based, environmentally friendly rust remover that eliminates flash rust in 10 minutes and deep rust in hours. One gallon removes rust from up to 300 lb., or approximately 20 sq. ft., of rusted steel. It will not harm unrusted steel, brass, copper, aluminum, galvanization, rubber, plastic, PVC, Viton, vinyl, or clothing. No special equipment or protective clothing is required and solution is reusable.