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I would but I can't seem to find a source here in US. It also is not very cheap. I did one low quality Aoto as per the advice of So, and it worked well, I use cashew lacquer for the job. One thing I...

Yes those too, as a matter of fact Aoto might need even more than lacquer, I'd put a layer of tissue paper to hold it together.

The only stones you need to seal is suita stones because they are layered and water might cause delamination. This will only happen if the stone is put trough extreme temperature cycling such as...

Oz,
sorry did not see your post earlier,
I do 3-6 coats, and have no problems with water. Some of my stones have been sealed for like an year and I have no issues whatsoever.

I use shellac and it works just fine.
To further reinforce the stone you can also add a layer of tissue paper around the sides and lacquer it, and if you want to go all the way mount it on a base.