Crawling is where the molten glaze withdraws into islands leaving bare clay patches.

Causes for crawling;
Presence of oil, grease and dust- reduce handling of bisque ware and use damp sponge to clean pots before glazing. If you are using underglaze powders mix with Universal Medium instead of water

Firing- initial firing stage should be slow to allow moisture and impurities to burn away, keep the kiln ventilated until 400°then add bung.

Glazing- cracking of glaze layer during drying can cause crawling. Also, ensure the glaze layer is completely dry before firing

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