Apply only one thin coat. Then, remove any dust nibs with 1,500-grit sandpaper or a piece of brown paper bag. Finally, using a soft cotton rag or polishing pad, buff the finish to a high shine using automotive paste wax, photo below, which has fine abrasives that polish the finish even further.
How to Polish Polyurethane. Saturate a 1000-grit sheet of wet/dry sandpaper in a bucket of water. Sand the surface of the polyurethane with the sandpaper, using small circular motions to remove any imperfections from the surface. Clean the surface with a pH-neutral cleanser and a sponge to remove any sanding debris.
These tips and techniques for applying oil-based polyurethane produce virtually. Even though I've built dozens of cabinets and furniture pieces, I don't. I like to use an old, clean cotton T-shirt for this and the wipe-on step shown later.
Oil-based polyurethane varnish brings out the wood's natural beauty or wood. Create a finishing room, or at least thoroughly clean your shop or garage of .