out to sea Posted July 30, 2021 Report Share Posted July 30, 2021 Hello! I would like to know if anyone has experience with either Alumina hydrate or wadding to prevent underglaze from sticking to kiln shelves. I have mugs that have underglaze on the bottom, I tested one of the colors I use frequently and it stuck to the shelf a little, so I am either thinking to add alumina to wax and brush it on, sprinkle dry alumina on the shelf or make some small wadding balls. My concern about the dry alumina is the chance that it might fall onto glazed surfaces below. Any thoughts on the best method? Thanks! Link to comment Share on other sites More sharing options...
Bill Kielb Posted July 30, 2021 Report Share Posted July 30, 2021 Hmm, how about setting the ware on a cookie or waster slab? Could always kiln wash the cookies as well. You have underglaze on the bottom of the foot ring? Link to comment Share on other sites More sharing options...
Min Posted July 30, 2021 Report Share Posted July 30, 2021 For soda, salt and wood firings wadding works great to keep the pots from sticking to the shelves. Don't see why it wouldn't work for your mugs also if the wads went on areas without the fluxy underglaze. 3 wads total, 1 on the base under the handle for stability then 2 more around the edges. If the underglaze is fluxing enough to stick to the shelf then I would be concerned that the alumina kiln wash or just dry alumina hydrate will stick to the underglaze which would make a sandpaper rough surface. Link to comment Share on other sites More sharing options...
out to sea Posted July 30, 2021 Author Report Share Posted July 30, 2021 Thanks, Min! I was worried about that. I’ll try the wadding and see how it goes and to Bill, I think the cookie would stick as well. I don’t trim all of my mugs with a foot. These in particular are flat on the bottom so I could curve the image around. Link to comment Share on other sites More sharing options...
Chilly Posted July 30, 2021 Report Share Posted July 30, 2021 If you made the bottom of the pot slightly concave, leaving a kind of foot ring, you could paint as you are now, and then lightly rub the foot ring so it was almost clean, leaving a ghost of the drawing. Then it might not stick. Link to comment Share on other sites More sharing options...
Roberta12 Posted July 30, 2021 Report Share Posted July 30, 2021 I put ug on the bottom of a number of my pieces and I haven't had problems with sticking. But....I use cookies under them, cookies that are kilnwashed. And I use the alumina and was combo on the bottoms of porcelain to prevent plucking. The alumina sands off after firing. Roberta Link to comment Share on other sites More sharing options...
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