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HomeNewswet sanding polyurethane finish

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

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