Things You'll Need
220 grit sandpaper
Mop or cloth
Multipurpose cleaner
Foam brush
Polyurethane coating
Before applying a polyurethane coating, a wood surface should be cleaned to remove dust and debris. Sometimes, even with pre-prep cleaning, dust still makes its way into your freshly painted and still wet polyurethane. Dust stuck in the polyurethane gives your wood surface a permanent dirty appearance. Dust trapped underneath the clear polyurethane coating will not wipe away. Minor refinishing is the only cure for this problem.
Step 1
Sand away the dust areas with 220 grit sandpaper.
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Step 2
Smooth out the areas around where you just sanded with sandpaper to make the wood surface even and level.
Step 3
Clean the wood surface with a mop or cloth and a multisurface cleaner to remove any dust or debris from sanding. Allow the area to dry.
Step 4
Apply a new coat of polyurethane over the area you sanded. Use a clean foam brush to apply the polyurethane coating. If you did extensive sanding, you might have to re-coat the entire wood surface with polyurethane. If the sanding was minimal, you can get away with just re-coating the sanded area.
Step 5
Allow the polyurethane coating to dry for 24 hours.
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