Also I /and my students use 20 dipping glazes, stroke and coat, and some other cone 6 paint on glazes. Probably 5.000 pounds of this clay in the last 5 years. I wonder why you are having this problem and what glazes you are using.
I find this clay to have other problems, but they are outweighed by all the positive things such as the absorption rate, and the shrinkage rate. And the price. I’ve never had glaze problems with this clay, and I’ve been using thousands of pounds of it for probably five years.