Removes two to three coats of enamel, oil and latex paint, varnish, lacquer, shellac, urethane, and polyurethane. Removes most clear finishes in 5 to 10 minutes, most painted finishes in 15 to 30 minutes. Semi-paste works on horizontal and vertical surfaces. For interior or exterior use. Contractor's choice. Scrape off old finish with a putty knife.