We have a very large pot that we use for an outdoor water feature. This past winter we had a few abnormal freezes for Phoenix AZ and the glaze on the pot has started to pop and crack revealing the red clay. The pot is only a couple years old and was expensive. The fountain has been turned off, the pot removed and dryed. Is there product to use or something we can do keep the rest of the glaze from cracking/popping off? Any help you could give, would be greatly appreciated. (photo of area is attached) Thank you.