March 20, 2015
Sanding involves scratching, there's no way around it. Are you working with unfinished flooring, or something that's already been finished? If the flooring has a finish on it, one of the only things that may work is a microabrasive. You could even try something like a Mr. Clean Magic Eraser.
Otherwise, it really depends on your application. If you're looking to sand something in preparation for stain and poly, 220 is the highest grit you'll need. If you need to remove a lot of material, then you should start with 80-100 grit, and move up to 150, then finally 220.
Lastly, if you've got a large area to do like a floor, you won't want to use a 5" disc sander. You'll want to rent a floor sander, or at least use a belt sander.
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