To remove an oil-based polyurethane wood finish, you have to make certain to purchase oil-based polyurethane stripper, not water-based stripper. Removing the old finish can revive your wooden furniture, cabinets or floors; you will be left with naked wood to be treated with a new finish.
Step 1 - Observe Safety Measures
Before you apply the stripper, put on your safety gear, rubber gloves and safety goggles. Be certain to open a window for ventilation. The fumes are very strong, and proper air flow is vital.
Step 2 - Apply the Polyurethane Stripper
Use a paintbrush to apply the stripper. Make certain you distribute it evenly over the surface.
Step 3 - Remove the Polyurethane
Use the scraper to take off the polyurethane; go with the grain. Scrape until the last of the oil-based polyurethane is gone, and you are left with exposed wood.
Step 4 - Sand the Surface
Now use the sandpaper on the exposed wood; sand the surface until it is absolutely smooth. In addition to creating a smooth surface, sanding will also get rid of any oil-based polyurethane that is left.