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The sand paper comes in a number of grits (courseness) the lower the number on it the courser the grit and therefore the more deeply it scrapes the suface. In wood finishing we use the sandpapper from the lowest to highest grite to give the woods surface as smooth a finish as possible and so that the finsh materials like. french polish, varnish will give an almost mirror like finsh. On a door we use it to knoch back any small blemishes to the point where we can start appltying a varnish or wax only polish. as we ally each coat we use a very "mild" sandpaper to remove an dust specs that could have landed on the surface of the door as it dried. it also provieds a key so thatthe next coat will"stick". Placing any finish on wood means the next coat will not stisk as evenly as it going on a shiney surface. We "key" the surface and then using a "tack rag" which is slitly sticky we remove any dust then reapply a new finish coat we do the same for painted surfaces as well.

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10y ago
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9y ago

To knock out the irregularities of the door

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Q: Why painters use sand papers on doors?
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