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It's good to have around if you buy a lot of vintage stones. I've never been able to get a stone perfectly flat using SIC (it's usually low on the edges for me) but it's good for grunt work.

You can use it on anything flat. I usually use the back side of my DMT for SIC. It won't get it perfectly flat but it's good for rapid removal to get past dishes or chips. Once you get past the...

Have you tried some coarse SIC powder? It should eat 1/8" off of it pretty quickly.