Note: The first coat needs the most sanding to appear smooth; don't worry if it doesn't look as flawless as you'd like at first. It looks terribly uneven, but the highs to lows (glossy to dull) are only a few ten thousandths apart. Mark Augustin says: September 23, 2013 at 6:21 pm. Buffing the Finished Surface Spritz over the finished surface with tap water. ... 7 Responses to Rubbing Out a Polyurethane Varnish Finish. Four regular coats of urethane applied one over the other is a good starting point. The first thing to understand is the need to begin with a thick polyurethane finish film to ensure that you don’t buff right through to bare wood. Look closely, at eye level, across the surface of the dried polyurethane for any bumps or dust specks. To give the subsequent poly layers something to bond to, sand lightly between coats with 320-grit sandpaper wrapped around a hard block. After the third coat, sand with 320-grit, then 400-, and finally 600-grit sandpaper. Sanding through all the grits to 220 grit won’t improve the finish one bit. After applying the first two coats of polyurethane, it is important to remove any blemishes in the dried polyurethane by both wet sanding and using a razor blade. Polyurethane Finish Tip#1: Start With a Thick Coating. That’s not to say you should apply each coat thickly. It is imperative that polyurethane be allowed to cure thoroughly before wet sanding to get the best results. Step 1 Inspect the polyurethane finish after it is dry to the touch. I generally start at 80 grit and end with 100 or 120 grit. After you’ve applied … The un-touched glossy varnish is broken up by the duller patches leveled by the wet sanding. Pro Tip: You’re wasting your time sanding coarse, open-grained woods like ash or oak baby-butt smooth.
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