How to Make Your Own Rock Polishing Grit

Mar 28, 2018 - Rock polishing grit is made of silicon carbide, a substance harder than most rocks. It is much the same as silica sand, a sand used in sandblasting with a primary component of quartz. Polishing grit comes in coarse, medium and fine grits, just like sandpaper. The 80 grit is coarse, like unground sea salt; 120 and 220

Got my son a tumbler for Christmas. He loves it but it came with 4 stages of sand grit that only has 1 use. Is there a source to get this sand

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