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If you spray some water on the label side in short order you'll be able to peel the label off easily if it is anything like the couple of Tams I've had. You can reglue on the gouged side or just put...

+1, a waste of good stone especially if you're going to have to get below the gouge you mentiond.

I have used a DMTC 325 on Tams, coticules, eschers and all of my synthetics above 1k with no problems. Just do it in the sink with a bit of water running the swarf off to protect the nickel on your...