Hello Everyone, well I have one particular kiln shelf where the kiln wash will not stick to it. The recipe I use is 2 EPK, 2 Flint, 1 Alumina hydrate. On my other shelves this recipe works fine except for this one. I have to rewash it every time because it flakes off. I have scrapped off all the remaining in between each wash and placed two layers on each time. Any suggestions on what might be causing this?