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The higher the number code printed on the back of all sandpaper the finer the grit. With a little practice you can begin to understand what grit is appropriate for any given job. For instance, I refinish hardwood floors and it requires three courses of sanding. To help quickly remove an old finish from hardwood floors I start with a very course #20 sandpaper. It is so rough that it removes a large amount of material pretty quickly. Then, when I have sanded the floor down to bare wood I "step up" to 60 grit sandpaper. Once I've gone over the entire floor with the 60 grit I "step up" again to the finer 100 grit paper. When refinishing wood floors or furniture it is necessary to use several courses of sanding to help remove the deep scratches created by the rougher grits of sandpaper. I hope this helps.

John

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