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I noticed it says soak for at least 3 minutes. It will be interesting to see what Naniwa comes back with. I sent an email asking about the subject.

I will contact the manufacture and get their advice and reply once I get it. Not trying to get everyone pissed off. Just trying to give fact based answers. The experience of one or two is not enough...

Here is what this seller of Chosera stones says...

http://www.fine-tools.com/naniwa-chosera.html


"IMPORTANT NOTE on storage and lubrication: Chosera sharpening stones are bound with magnesium...

Soaking Chosera's will ruin them.