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Here is something from their website that gives some info on the composition of their abrasive. I find lapping in the sink under lightly running water eliminates any stiction issues. I have the XX,...

Same here. The XX 125 eats hones for breakfast and cries for more. It does leave deeper scratches though. The 325 takes care of those and between the two way less work.

If you are doing the lion's share of the lapping with something else you might get by with a higher grit plate for cleaning the swarf while honing and not ruining the plate. OTOH, you may wear the...