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I never had any problems caused by lapping my stones with the DMT 325 and 600. Especially the 600 is over the top and leaves a perfect surface on the stone.
I used them to lap my Naniwa Superstones,...

Good idea, I will give that a try! I have felt a sensation of grittyness that I can not attribute to bad flattening. I have lapped the stone with dmt 325 and 600 thoroughly. I was wondering if the...

I think Mainman is absolutely right. The polish of a bevel does not relate to the quality of the edge.
There is no doubt in my mind the sigma 13k is a very fine stone. Since grit and microns don't...

I have noticed similar. The Sigma 13k Select II does indeed scratch the bevel, not unlike natural stones.
If you are interested, I am working on a review regarding the Sigma Select II 13k and can...