Why Sand Wet?
Borrowing from the bodyshop. Resin-impregnated sandpaper, in grits ranging from 320 to 2000, is available from auto-body paint and supply stores. The abrasive particles on these sandpapers are of a more uniform size than those of common woodworking sandpapers and are more securely bonded to the backing paper.
This wet/dry sandpaper can be used either dry, like common woodworking sandpaper, or wet, using a rubber sanding block and solution of liquid detergent and water. Wet-sanding lubricates the surface being abraded, reducing scratches. The water also carries away loose pieces of abrasive as well as finish particles and prevents the sandpaper from loading up.
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