I just use the three basic grits: coarse, medium and fine. They are colour-coded. Yes, you do have to watch the heat/colour carefully, especially as you get near the edge and as the edge gets finer. LIght pressure and a manual check with bare hand, or regular dunking in water, or apply a sopping wet rag if it's in a vise and you don't want the hassle of taking it out to dunk in cold water.Information
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