One application will remove five to six coats of enamel, oil and latex paints, varnish, lacquer, shellac, water-borne finish, urethane, and polyurethane. Removes most clear finishes in 5 to 10 minutes, most painted finishes in 15 to 30 minutes. Works on horizontal and vertical surfaces. Non-flammable. For interior or exterior use. Scrape off old finish with a putty knife.