Crawling

About 1/3 of the pots in this firing had glaze crawling. So that's a bummer, but I can put some more glaze on them and fire them again. That usually works. I have to find out why this is happening. I usually damp sponge my bisque and also blow it off really well with the air hose to get any dust off. It doesn't necessarily seem to be happening only where the glaze is thick either. Those two things, dirty bisque and thick glaze are what I think normally cause crawling. If any one has suggestions leave me a comment. I'll be consulting my books in the mean time.