Crawling glazes withdraw into islands during melting leaving bare body patches

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This problem is almost always caused by glazes shrinking too much during drying, and then cracking. Those cracks become the crawl points during firing. Excessive shrinkage is normally a product of too much raw clay in a glaze. Even glazes having marginally high clay can crack if applied too thick. It is likewise with multi-layer application without consideration for the specific needs of that process (e.g. failure to use a base coat glaze for the first layer). Multi-layering of glazes rewets the first layer, stressing its bond with the body and pulling it away from the body as it shrinks, base coat glazes have better adherence. Crawling is quite prevalent in once-fired ware since glaze bonding is more tenuous.

To state again: Glazes contain clay to suspend their slurries. Clay shrinks when it dries. Some shrinkage can be tolerated but when it is excessive something has to give. As glaze layer thickness increases it is afforded more and more power to impose its shrinkage on the bond with the body. At some point, that bond will be compromised in places where cracks occur to release the tension. Even if these do not appear on dry ware, bond compromise can still exist.

Crawling glazes withdraw into islands during melting leaving bare body patches

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