Minwax PolyShades is an aerosol spray. It combines wood stain and polyurethane in one simple step. The easy-to-use polyurethane spray covers large surfaces and tricky corners with just one application. Spread the sealant spray directly over the polyurethane finishes to change the existing color of your wood without removing the existing finish. Use the polyurethane spray for bare wood, stripped wood, veneer, plywood, softwood, and hardwood.