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Just found the thread.

http://straightrazorpalace.com/hones/69088-how-about-lapping-silicon-carbide.html

The grit, with glue residue, would stick to and therefore embed easier. I use loose 220 grit silicone carbide and water on a glass plate to lap 1 k to 12 k naniwas with no problems. I searched for...

I have read on SRP where no less than 3 abrasives company sales reps have said not to use sandpaper for lapping stones. It is not the abrasive so much as it is the glue on the sandpaper which causes...