Im new at this but here goes. I work on low fire clay, bisque at cone 04
then
underglaze and glaze at cone 06. But a few years ago I had some pots laying
around the studio that had been fired to cone 6. I underglazed, and glazed
them
at cone 06 and it worked. So maybe you can bisque to cone 6, then undetglaze
and glaze to cone 06. Might be worth a try.
