You shouldnt sand alum with courser than 400 grit. It can creates scratches that can be too deep to sand out without removing A LOT of material. Otherwise. Wow. This is a interesting method.
You shouldnt sand alum with courser than 400 grit. It can creates scratches that can be too deep to sand out without removing A LOT of material. Otherwise. Wow. This is a interesting method.
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