Galilica Posted October 21, 2012 Report Share Posted October 21, 2012 Hi, Used a new glaze for English-cake pans and the glaze (beautiful color - Amaco PC 20 blue rutile) came out of the kiln (cone 5 fire) like it wrapped The glaze was pretty thick. Could it be a result of different shrinkage level than the body's? Thanks Link to comment Share on other sites More sharing options...
Mark C. Posted October 22, 2012 Report Share Posted October 22, 2012 Looks like a crawl to me Not sure what a wrapped is?-like a fruit wrap? Reasons may include to thick glaze dirty /dusty/oily bisque ware which can effect adhesion to clay My guess is to thick-rutile bases are somewhat troublesome anyway. Next time thin glaze 1st or wet pot Mark Link to comment Share on other sites More sharing options...
Lucille Oka Posted October 22, 2012 Report Share Posted October 22, 2012 What clay body are you using? To what cone did you bisque fire? Your vessel seems a bit too thin to hold on to such a thick coating of glaze. It appears that your thin clay vitrified causing the glaze to run off and not adhere properly. Do your tests on thicker clay samples. Use only the recommended amount of coats for the glaze. Link to comment Share on other sites More sharing options...
Galilica Posted October 22, 2012 Author Report Share Posted October 22, 2012 What clay body are you using? To what cone did you bisque fire? Your vessel seems a bit too thin to hold on to such a thick coating of glaze. It appears that your thin clay vitrified causing the glaze to run off and not adhere properly. Do your tests on thicker clay samples. Use only the recommended amount of coats for the glaze. I used cork (sibelco k 3005), bisque fired it to cone 08. it happened also with white clay. Link to comment Share on other sites More sharing options...
Galilica Posted October 23, 2012 Author Report Share Posted October 23, 2012 Looks like a crawl to me Not sure what a wrapped is?-like a fruit wrap? Reasons may include to thick glaze dirty /dusty/oily bisque ware which can effect adhesion to clay My guess is to thick-rutile bases are somewhat troublesome anyway. Next time thin glaze 1st or wet pot Mark Thanks, Mark. i use to wet my pots before glazing, so i guess it's something with the glaze. although rutile suppose to be thick, I'll try to dilute it a little for my next trial. Link to comment Share on other sites More sharing options...
bciskepottery Posted October 24, 2012 Report Share Posted October 24, 2012 Was the glaze still wet when it was loaded into the kiln and fired? This result could be a combination of the glaze application being too thick and/or not completely dry when fired. Link to comment Share on other sites More sharing options...
koreyej Posted October 26, 2012 Report Share Posted October 26, 2012 Was the glaze still wet when it was loaded into the kiln and fired? This result could be a combination of the glaze application being too thick and/or not completely dry when fired. I agree. I use that glaze and have not had that issue. It prefers to be dipped than brushed, how did you apply it? Link to comment Share on other sites More sharing options...
neilestrick Posted October 27, 2012 Report Share Posted October 27, 2012 ... not completely dry when fired. I put wet pots into the kiln almost every firing. Link to comment Share on other sites More sharing options...
LilyT Posted October 28, 2012 Report Share Posted October 28, 2012 Several of the Amaco PC glazes have crawled when I used them. The coatings need to be thick, and I can see that you are getting the float effect so yours is thick. I think that the nice thin pieces like yours need extra time to let the first coat(s) dry before applying the subsequent coat(s), otherwise the first coat isn't firmed up yet, and the rehydrating action of the new coat might cause it to loosen from the pot... though not necessarily visibly. HAve you tried using it again? It's a nice glaze. Link to comment Share on other sites More sharing options...
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