Sanding Polyurethane Smooth

You dont need the lower coat to be super smooth because the upper coat will cover the roughness from sanding anyway. It seems completely counterintuitive but to make a finish really shine you have to start by sanding it dull photo 2. The approach you use in fixing polyurethane bubbles puddles runs and brush marks should be based on the size and thickness of your flaws and the time polyurethane finish has had to set up.
sanding polyurethane smooth

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Youre wasting your time sanding coarse open grained woods like ash or oak baby butt smooth.

Sanding polyurethane smooth. In addition to that sanding between coats specifically should not be relied upon to ensure a smooth uniform finish there are much better methods none of which waste finish needlessly more on this below. De nibbing where it serves a specific and necessary function for most users. The first coat needs the most sanding to appear smooth. Four regular coats of urethane applied one over the other is a good starting point.

Dip your sanding block in the water and wet sand in the direction of the grain. The first thing to understand is the need to begin with a thick polyurethane finish film to ensure that you dont buff right through to bare wood. Im not really a fan of poly i find it dies too quickly. Start with a thick coating.

It must be completely dry then i take a sanding block usually about 4 and put 2000 grit. Finish tends to be thinner at tabletop edges. Thats not to say you should apply each coat thickly. Not to hard to remove the polyurethane you just want to remove the bumps.

Sand in alternating directions with each abrasive to make it easier to see whether youve removed the scratches from the previous grit. Let each coat dry before sanding. How to smooth out a rough polyurethane finish. Sanding through all the grits to 220 grit wont improve the finish one bit.

Enjoy the videos and music you love upload original content and share it all with friends family and the world on youtube. For application i use a china bristle brush. Use special care in these areas to avoid sanding through. Yes 2000 grit not 200 grit sandpaper in it and get a bowl of water.

You sand polyurethane to a remove any dust bumps in the lower coat and b cut the surface of the lower coat so that the upper coat has more surface area to bond to. After the third coat sand with 320 grit then 400 and finally 600 grit sandpaper. Smooth and flatten the finish. I use 220 grit.

It should be done for one reason only. Sanding removes dust nibs and brush marks and leaves the finish smooth and flat. I generally start at 80 grit and end with 100 or 120 grit. Dont worry if it doesnt look as flawless as youd like at first.

Before my final coat even if my previous coat was perfect i sand with 400 600 and 0000 steel wool to make it silky smooth before that last coat.