Crawling Description

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What is pinholing?

Crawling Description

Crawling is the flaw we're most likely to see as a result of misapplication of the glaze. A crawled glaze coating will peel off the clay or an underlying glaze layer leaving a bald patch. If the raw glaze hasn't adhered well to the bisqueware, the surface tension of the glaze can make it peel away from the surface either as it dries or fires. If the bisque is dusty or saturated with water, the glaze won't stick very well. Glazes that contain lots of clay, zinc or gerstley borate are predisposed to crawling because these materials tend to hold a lot of water and shrink a lot as they dry. If the glaze is applied too thickly it only makes matters worse.

   

Comments

9/20/2011 2:18:18 PM
PM993G said:

Incorrect. see other comments on crawling. It is your glaze composition.




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