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Thanks for the replies! I was thinking last night what could have caused this and I think you're right about the wet shelf. As we hadn't fired the larger kiln since our move, I decided to put shelf wash on the base of the kiln as well as the shelf, which was on legs, and fire them both together. I t...

OK, this never happened before! I cleaned a shelf that I hadn't used in years and applied my shelf primer as I always have. I used the same primer 5 days earlier with no problems. I put the shelf in my kiln and fired it as always relatively slowly to 500 f. I also vented the kiln and observed steam/...