I posted this on another site but would appreciate your opinions

I've been using a SR for over a month now and have been honing my vintage blades on a 1K, 4K, 8k, and 10K with shave-able success, lately (Thank You all for your advise)

So after reading many threads I decided to try a JNat whetstone for finishing, I purchased a Ozuku from Fendrihan and when it arrived yesterday I was excited to try it so I sealed the edges with nail polish but noticed a 30mm crack, I emailed Fendrihan right away and told them about the crack and that I can feel it with my fingernail, they replied that this is not only okay but normal

Opinions please

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