Paste wax is best used as a polish over an existing finish such as lacquer, varnish, shellac, polyurethane or even oil finishes. The finish will appear shiner and deeper because the light that was getting trapped in those scratches and voids before the wax was applied, is now reflecting off the surface.Click to see full answer. Just so, how soon can you wax polyurethane?Yes, any finish should be allowed to fully cure before applying any wax. With polyurethane that would be about a month. There really isn’t any benefit to using wax on polyurethane other than appearance. It is a plastic coating which doesn’t need moisturizing from a wax.One may also ask, how do you smooth out polyurethane finish? How to Get a Smooth Polyurethane Finish Overview: Materials and techniques. Tip 1: Sand out pencil marks. Tip 2: Maintain a clean work area. Tip 3: Wipe the project with mineral spirits. Tip 4: Use a roller on large, flat surfaces. Tip 5: Finish both sides at once. Tip 6: Use wipe on poly for small or tight areas. Tip 7: Lightly sand with pads and paper. Similarly, do you sand the final coat of polyurethane? No, you don’t sand the final coat. You make sure you either spray it, or lay it on nice and even. Sand the previous coats to make sure there is a perfectly flat and even base for the final coat.How long should polyurethane CURE before buffing?There is more than one kind of minwax poly, spray or wipe, etc – they’ll have good instructions on their site. When I use their poly wipe on, I usually put about 12 coats and let it dry two weeks in a heated stable humidity environment before buffing.