Pottery - unbreakable glaze

I want my native Chestnut Ridge tribe to have long traditions involving pottery. I want them o be known for a certain style, and I think the raw pottery with no glaze might be their pottery. But we can add unbreakable glaze, which obviously make the craft more solid. Question is then , will pottery item with no glaze at all be very breakable? Or will Pottery skill affect that, making pottery by a well skilled sim be quite unbreakable even  without the glaze? Or is all unglazed pottery short lived?

Picture shows teen daughter Orella Chestnut being mentored by mum, Amalie, who is top skilled. The Chesnut tribe has a tradition of all females maxing the Pottery skills. Some crafts they sell at the local market. This family lives off the grid up at Galloping Gulch, so I had to offer them a small community pottery shed down in the village. Other families might use this shed too, but I doubt they will bother with maxing the skill, so the Chestnut tribe's offer is still of great value. (Hm, maybe it would be better not to glaze at all, when something breaks, they will buy a replacement...)

Anyone?