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I don't think an Asagi will accomplish either in a few hundred strokes unless a nagura is used.

Thanks for the link. That was from the period when I was stuck of a farm without internet access so I missed it.

Ah-ha. Now I now what Lynn meant when he called one of his Japanese hones a Shooby-Dooby!

If you don't plan on soaking the stone, and I don't know why you would, then I don't think there is any need to seal the edges.