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Personally, I've only had to toss 2 blanks out of around 40-50 from Masecraft. Might just be good luck. I have a couple questionable pieces from a recent order from them, so, that number might go...

I bake them in a clamped contraption @ 220 deg or so for 15-20 min as mainaman suggested.

if they are too extremely warped, I don't use them at all.

I was talking to Max in chat one day..he...