Minwax polyurethane is a protective varnish that is used to seal the wood stain. However, if you're not careful, small air bubbles can mar the beauty of the finish permanently. By Earlier this year I made a few of these small Arts and Crafts tables from some reclaimed wood. As a result, it felt a little rough to the touch, so today Leigh Ann and I went back and took care of the dust and bubbles that had made it feel so rough. Minwax® PolyShades® enhances wood grain by combining beautiful rich stain color and long-lasting polyurethane protection in one easy step. At the time I only had a chance to brush on one coat of finish, which I did rather quickly. It can also be used over polyurethane finishes, so you can change the color of your finished wood, without removing the existing finish. It's an oil-based, clear finish that's applied in several coats after staining, and is fast-drying and appropriate for any indoor wood surfaces, such as cabinets, bookcases, trim, and doors. Bubbles and Dust Beware!