PPC METAL READY Rust Remover and Pre-primer - EtchesRust remover and Pre primer It Etches metal and leaves a Zinc Phosphate coating. Water based non toxic, non flammable, non caustic and non corrosive. USAGES: Removes rust by dissolving it. Etches metal to provide a better surface. The metal is left ready to paint. It promotes better paint adhesion. Improves welding conductivity. Removes rust stains from non metallic surfaces porcelain, ceramic, fiberglass. PPC Metal Ready is not a long term rust