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Personally I think that sealing any stone natural or synthetic is fine but I wouldn't bother sealing lower grits,I can't see the point in that.
Maybe if I would have sealed the 10k straight away...

I have sealed my Chosera 10k , Gok 20k, and all my jnats and Nagura stones.
Mould never occurred to me though.

The Gok and the Naguras I sealed to keep them clean and maintain stamps.
I didn't...