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
DIY Rock Tumbler - Results!
[5 STEPS] Just measure in the grit, add enough water to cover the stones, seal the barrel, and tumble. The only variable is how much of the product to
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