If you mix gum arabic in with the glaze it will make the glaze stick. another thing you can try is putting the pots back into the kiln with just the bottom switch on low for an hour or so to warm the pots up. When you put the glaze on right after they come out of the kiln the water in the glaze will evaporate much faster and the glaze will stick. This shouldn't make the pots too hot to work with.
Ceramics and Art Education