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Aoto also are prone to cracking but I imagine not many use Aoto on razors

This is interesting Stefan. How many coats ? No problem with water affecting the shellac ?

Some J-NATS are more prone to cracking, especially Aoto. The sides & base are often coated in urushi over paper. A bit like the concept in fibreglassing.
Might not stop cracks but gives more...

You can use a spray can of automotive clear coat or any clear that is an alkyd ester.
Water resistant & tuff but slippery when wet.
Just put the stone face down on a cloth to prevent runs onto the...