moh Posted October 24, 2019 Report Share Posted October 24, 2019 I've been facing this strange behavior of this particular clear glaze. It's not every firing, but some. And even in the same kiln firing, this doesn't happen in some and pretty badly in other pieces. Any ideas? Left is the strange one, right is ideal. No wax, no lotion, no dirty that's been sitting on it (pieces are all wiped clean before glazing). Link to comment Share on other sites More sharing options...
liambesaw Posted October 24, 2019 Report Share Posted October 24, 2019 Looks more structural than glaze to me, maybe some pyroplastic memory coming back to haunt you? Looks dented in quite a bit Link to comment Share on other sites More sharing options...
Babs Posted October 24, 2019 Report Share Posted October 24, 2019 Make be the photo but is the lhs glaze much thicker in application as it is less transparent. Fingerprint places prior to glazing. Oily moisturizer fingerprints?? Link to comment Share on other sites More sharing options...
neilestrick Posted October 24, 2019 Report Share Posted October 24, 2019 The glaze appears to be quite thick in application. That alone can cause crawling. It also looks quite stiff. A little more melt may help, either by going hotter or adjusting the chemistry. Link to comment Share on other sites More sharing options...
neilestrick Posted October 24, 2019 Report Share Posted October 24, 2019 56 minutes ago, liambesaw said: Looks more structural than glaze to me, maybe some pyroplastic memory coming back to haunt you? Looks dented in quite a bit I think the 'dents' are where the glaze crawled, not actually dents. Link to comment Share on other sites More sharing options...
liambesaw Posted October 24, 2019 Report Share Posted October 24, 2019 7 minutes ago, neilestrick said: I think the 'dents' are where the glaze crawled, not actually dents. They're just so shiny, usually when I get a crawling glaze it is rough where it crawled If it's crawled then yeah, it definitely looks like finger marks Link to comment Share on other sites More sharing options...
Bill Kielb Posted October 24, 2019 Report Share Posted October 24, 2019 I would definitely try thinner glaze application to rule it out. Simple fix if it works. Link to comment Share on other sites More sharing options...
GEP Posted October 25, 2019 Report Share Posted October 25, 2019 I am also in agreement that the one on the left looks too thick. I would advise developing some process/techniques to make sure your glazing is consistent from pot to pot, such as using a hydrometer, and timed dips or timed sprays. Link to comment Share on other sites More sharing options...
moh Posted November 19, 2019 Author Report Share Posted November 19, 2019 Thanks everyone, and I've found the problem and solution! When I glaze smaller pieces I've usually done a single dip to cover both inside and out. This worked when my pots were thicker. But I've since thinned my walls, and the issue was being caused by too much water and too thin a wall for the water from the glaze to go. What I do now is -- glaze the interior, let it sit for a few minutes and then dip the outside separately. Haven't had a problem since changing to this method. I usually work in batches so the timing works out well. Link to comment Share on other sites More sharing options...
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