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Thanks for all your helpful responses - after much studying of the end result, I believe it is a combination of issues that has prompted the bubbles. I do not have a flat shelf, as predicted, and I firmly believe the single layer of white with a second layer around the edge was the perfect setup for...

Thanks Lisa - I hope that's it! This is my first serious run with BE, and I had lost all confidence in my scheduling abilities. It is a new kiln and new shelves at a studio I'm helping get up and running with fusing, but I thought I had done enough tests. Guess not....

I recently started using BE on kilnwashed shelves and have just started experiencing bubbles from the kiln shelf side. I had done a dozen test firings with all sizes, on the shelf and on paper, and only had one bubble before, but now I've gotten 2 in a row (projects over 6" in diameter). Can yo...