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Alex,
I just want to say I went full strength with the cashew lacquer on this stone, and its an overkill I think :)

urushi comes in different colors, red, black and yellow or clear, you probably had the yellow/clear one.

Cashew is very thick out of the can, and dries in ~1 day.
It bullet proofs the stone.
...

i just looked up what Namikawa states about cashew, it is synthetic while urushi is natural.
Urushi also causes severe allergic reactions, but in any case cashew worked very well for me.

Kevin,
I used it and looks like any other lacquer to me.
By consistency and appearance cashew lacquer is not paint am I wrong?

urushi dries in a few weeks, cashew lacquer dries in a day or two depending how thick you use it. I have been told that really any type of lacquer will work too.
If the stone does not have a crack...