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I have never had so much trouble with kiln shelves. I am wondering if I have done something wrong. I had all the shelves in my set to clean and apply kiln wash. It was daunting task with the pumice stone and chisel. So I used my orbital sander and it went so fast that I am wondering why I've never seen anyone suggest it. Then I put kiln wash on all of them. I thinned the wash (as I have learned that it must be as thin as half and half milk). Brushed it on in different directions to get a complete coverage. This has worked every other time I've done it - until now. After the 3rd coat, about half of the shelves had the wash crackle and fall off. I washed them clean and reapplied. This time fewer of them crackled. Cleaned them and re-applied. This time I'm down to 3 that crackled. Couldn't get 2 of these to hold so I cleaned them very well spraying them with water to make sure there was no dust on them, let them dry in the sun, and turned them over. When they were dry, one of them turned blotchy green - mold??? I applied kiln wash. It didn't want to stick to the green areas, but eventually I got 2 coats to stick. I plan to fire these last shelves in my next glaze kiln. This is so crazy. I've never had these problems before. Has anyone else experienced these problems? Any ideas what is happening here?