I have a beautiful 9" cobalt blue Chantal pie dish that has an unglazed bottom. It is about 5 years old. It baked beautifully at first, then started oozing a thick, sticky, greasy substance from the unglazed bottom. It has gotten so bad now that it drips this stuff onto my oven floor, and is simply not worth the mess it creates. The entire bottom of the pan is coated with this messy substance and is impossible to clean off while the pie is still in it. Has anyone had this happen, and is there a remedy?