323171 (1 gallon). Is fast-acting and will efficiently remove all types of finish from metal surfaces. Effective on acrylics, lacquers, polyurethanes and baked enamels. Non-corrosive to all common metals under normal exposure time. FOR BEST RESULTS Let the stripper stand until finish is completely blistered or liquefied. Multiple coats may require repeat application. If paint has not bubbled, surface must be kept wet with stripper. Removes any type of finish from metal surfaces including acrylic, lacquer, polyurethane and baked enamel. Fast acting finish stripper works in 20 to 45 minutes on most coatings. Use outdoors or in a well ventilated area - not recommended for use on fiberglass, plastic or any synthetic substrates. Aircraft paint remover is non-corrosive on metal with normal exposure time.