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7. Once Gary was satisfied with the work, he sanded the trim with 220- and 320-grit sandpaper. At this point the trim is pretty smooth, but he went further by wet-sanding with 400-grit along with some soapy water to act as a lubricating agent. If you want, you could go all the way up to 1,000-grit wet, but Gary says the end result would be the same.