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Was the 12K stone you have the half stone? If so, I agree bad stone. I had one, I threw it away.

Don't let that stone mar the pro series of stones, these are very, very good.

Actually, due to...

Lap it with something coarser, say a 400-600. It's the smaller grits that seem to work their way into the binder of these polish stones. You can use a nagura on this stone to clean/lap it too. This...

I had a similiar problem with this Shapton stone. Long story short, this stone should not be lapped by anything except maybe a diamond plate. The stone is so dense that anything you lap it with will...