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Kiln Wash Wont Stick To One Shelf

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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?


Thank you




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I suggest grinding down to a very clean surface with a 4 inch grinder(hand power tool) or larger.

Some old wash or something is still left on and may be the culprit.Hand scraping is not taking it off?


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