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As a follow up I lapped this 500 gs on a marble plate with a fresh sheet of 120 grit sic paper and a lot of water. It is behaving itself again. It's nice to have it back.

There is a lot to like with the glass stones. They are hard, don't load with metal the way regular Japanese waterstones do, very generous surface area, small form factor, pretty much splash and go,...

I will give it a try. It been really inconvenient. I lapped it coarsely to true it and remove swarf and I don't want to say glaze, but the stone went into some very odd halfway state. Odd binder, but...

Anyone have a good lapping protocol for the glass stones? My 500 has been acting very strange and lost a lot of cut post lap. Only lapped at 220. Final refresh with something coarser?