Step 1
1. Surface preparation 1.1 If the wood has been painted before and the film is peeling, or it is old wood that has never been painted, sand it back to the bare wood. For new wood, sand off excess wood fibers. Then clean the surface so it is free of grease, dust, oil and foreign matter. 1.2 If the polyurethane film is in good condition, scuff the film with No. 320 sandpaper and then clean the surface so it is free of grease, dust, oil and foreign matter. 1.3 If the wood has resin, wipe off the resin with Thinner M-77
