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What other hones are you lapping? I've found that the 120 is really better for heavy duty lapping. I saw you were looking at a thuringian and norton (assuming 4k/8k?). For the norton, I would lap...

Yeah, you can use the sandblaster wet. It's incredibly waterproof. Much more so than wet/dry paper. It's really different and great stuff, IMO.

Try the 3M sandblaster 120 grit paper. You can find it at autozone. Good stuff. It absolutely tears up naturals, but it handled the swaty pretty well also. Lasts a long time and the slurry...

You don't need a lapping stone. Sandpaper on your countertop/tile/etc is fine. The lapping stones are mostly for convenience/efficiency.

They do make life a lot easier, but if you're looking to...