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The premise behind color sanding and wet sanding is to use a sandpaper grit that's just coarse enough to remove surface imperfections. On large flat surfaces, Rodney prefers starting with 1,000-grit sanding discs measuring 6 inches in diameter for use with the orbital sander. Next, he hits the paint with a finer 1,500-grit paper. For smaller areas that require more finesse and hand sanding, the same material is available in square sheets that can also be used to wet sand.