I bought this product to strip the polyurethane finish off of an electric guitar body. The can says "works in 10 minutes" but I found it took 30 minutes to take effect. Furthermore, in 40 minutes the product dries and the polyurethane dries back into a hard, crusty mess that requires you to start the process all over again, so timing of the application and removal is crutial. Overall I would rate this product as mediocre, as it is strong enough to get the finish off eventually, but too weak to make the removal process convenient or easy. How strong of an "industrial" paint remover would be sold at Wal-Mart anyway???