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I wanted to re-clear my hardwood floors in my home but I didn't know what grit sandpaper I needed to do so. What is the best sandpaper grit to use in removing the polyurethane coat on a hardwood floor?

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    Scuff-sand to recoat, or sanding down to bare wood? – Ecnerwal Sep 3 '14 at 15:29
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If this is for removing the finish, I was told its more of a trial and error approach. We had very old floors with a very thick finish on them. So I was told to start with 36, if the sander did not go all the way to the wood or do a decent job removing the majority, then drop down to a 24 grit paper.

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Start with a rougher grit sandpaper and work your way down to a smooth paper. Generally I use three different papers. Rough to remove the majority of the varnish, medium to get the rest of the finish and smooth any larger wood issues, then a third run with a fine paper to make it all smooth.

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