Re: Embossed ceiling tiles
Overcuring is leaving it in the oven too long, or curing at too high a temp. In the case of your ceiling tiles, being so thin they will come up to curing temp very quickly and should be watched very colsely. Check the temp early in the cycle and stick closely to the recommended dwell times listed by the manufacturer. I would also advise laying them on something flat so they don't warp as badly as with hanging them.
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