Yep, thin it until it's about the same viscosity as polyurethane, then wipe it on with a cloth. You don't have much time to play around. As the acetone flashes off, things can get really sticky and turn bad if you try to go back over it. Try it on a test piece first. Soak your rag, get it on an area with a couple of quick passes, and then stay away from it. It's pretty tough.