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I really need some help with the mixing of high fire glazes and medium.

I have these 2 urns and my plan was to have a shiny white interior (stoneware 1200° C) interior with Amaco brush on on the outside, I've done the inside firing to 1200 with a 20min hold. My problem is that the interior has crawled badly so I thought I'd put crushed glass into it and refire, but having already fired to 1200 will the Amaco glazes actually work?

TIA

Andrea

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So you fired with only the inside glazed to1200?

And now you are to apply outside glaze and retire?

Would be pretty difficult to apply glaze successfully I think.

Is it just the bottom of interior which is crawled?

Glass would craze imo

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Yes Babs, I'm a real idiot. I don't know how my train of thought got so wrong. 

I've seen vids where reglazing is done, but I don't think they were originally fired to cone 8.

I was going to use the Amaco glazes and fire to cone 5. 

Since there is major crawling inside and one of the lids has cracked I think it is not even worth trying. I may just use one of them as a test at some stage just for curiosity. 

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You can refire something that has already been glaze fired, it is just a bit tricker, and the clay body is vitrified and doesn't hold on to the glaze as well as a porous body would.

Glazing vitrified wares takes multiple light coats.  You could also try adding an additive to the glaze, like a gum, that could help it adhere to the ware.  I've also heard of people heating the wares first, either in an oven, or even with a heat gun or hair dryer.   The hot surface causes the water to evaporate faster, meaning the glaze dries and sticks faster, similar to how it would on a porous surface.

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Andrea if the lid has a crack then forget it.  It’s become a test piece... which is a happy accident.  

Just reglaze with white inside and see how it works. 

As a test I have glazed as a 3rd fire after taking it to cone 6.  Some of the results I’ve liked because I like texture. But it’s been hard to replicate.   

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