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Faulty porcelain finish

what would be factors that would cause porcelain to pop off after it comes out of the furnace? I have no clue myself but it occurs in cycles of: OK for a few weeks,then it starts again, and I was wondering if humidity played any part--for it seems that pop-off is higher if it rains.

Thanks ,

phil whisenhunt
manufacturing - oakhurst, Oklahoma
2004

Are you applying your porcelain wet or dry electrostatically?

Charles Baldwin
Frit Supplier - Cleveland, Ohio
2004

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