redbourn Posted May 31, 2017 Report Share Posted May 31, 2017 Hi Friends, I was able to participate in a Lana Wilson workshop recently, where we made slabs with layers of underglazes on top, then scratched through and stretched. The slabs were lovely, and I made a small tray out of half of one of them. Bisque fired it, then applied a commercial clear satin glaze, fired to cone 6. The result was that the glaze made the underglazes run and soften a bit. An attractive result, but with the other half, which is a wall piece, I don't want the softening and running. A potter I met told me she seals her slip-transfer wares with a gerstley borate wash. Would this work for my slab, coated with underglaze, do you think? Other suggestions? I'd like a matte to satin finish. Thanks in advance, Lynn Link to comment Share on other sites More sharing options...
Marcia Selsor Posted May 31, 2017 Report Share Posted May 31, 2017 I think it was the underglazes made the glaze run. A gerstley borate wash would work, but you should test. Could the commercial glazes have been on too thick? Could it be you hit a hot ^6. Did you soak. Possibly the clear glaze doesn't need a soak. There are a lot of things that could have happened. Marcia Link to comment Share on other sites More sharing options...
neilestrick Posted May 31, 2017 Report Share Posted May 31, 2017 Underglazes will bleed out differently with different clear glazes. A lot of clear glazes are somewhat fluid, but it's hard to tell because they're clear. Others will tend to pick up the underglaze more than others. Test, test, test.... Link to comment Share on other sites More sharing options...
Chris Campbell Posted May 31, 2017 Report Share Posted May 31, 2017 If it is a wall piece you do not have to glaze it at all ... you could just spray it with a non-yellowing satin clear spray from a craft or paint store. Link to comment Share on other sites More sharing options...
High Bridge Pottery Posted May 31, 2017 Report Share Posted May 31, 2017 Gerstley borate is very good at melting so I am not sure it will achieve less movement in the underglaze. A different clear glaze is probably the answer, I would also try mixing the underglaze with some clay and see if it changes anything. Link to comment Share on other sites More sharing options...
oldlady Posted May 31, 2017 Report Share Posted May 31, 2017 have you considered asking lana wilson? i am sure you are not the first of her students with that question. she probably has the answer. Link to comment Share on other sites More sharing options...
redbourn Posted May 31, 2017 Author Report Share Posted May 31, 2017 These are all very helpful responses--thanks! As to the wall piece, I'll take Chris Campbells' suggestion. As to clear glazes, I guess the answer is to test, test, test. Lana Wilson gave us glaze recipes, but she uses a different clay body and different firing schedule than what I have access to. Link to comment Share on other sites More sharing options...
NancyAmores Posted June 2, 2017 Report Share Posted June 2, 2017 Are you using Amaco Velvets underglaze with their glazes? I've used both the HF-9 zinc free clear gloss and the HF-12 satin with the Velvets without any running, though the Satin did soften the colors and turned a bit cloudy because I applied too heavily. Link to comment Share on other sites More sharing options...
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