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Maybe it's worth approaching Naniwa Abrasives and see if it's some sort of batch issue. There are too many users with these cracking or crazing problems. As I mentioned earlier I've used Chosera and...

I appreciate some members have had some crazing on their Naniwa stones. I do not use my Naniwa's professionally, however I've been using a 1k Chosera for many years with no issues. I have used...