Kristin_Gail Posted August 11, 2013 Report Share Posted August 11, 2013 I'm finally set on what I'm using to coat the soft bricks in my electric-to-soda kiln conversion project. Now I wonder: Do I have to cook it on before I fire it with pieces inside? I've read that I need to bring it to bisque temp, empty - if so, why? Is there a reason I can't just paint it on today, load it tomorrow with pieces,fire it (now full) the next day? I single-fire, super-slow for the first few hours, if that makes a difference. Link to comment Share on other sites More sharing options...
Red Rocks Posted August 11, 2013 Report Share Posted August 11, 2013 What are you using to coat the kiln and what does the spec for the material say (if you have one?) Link to comment Share on other sites More sharing options...
TJR Posted August 11, 2013 Report Share Posted August 11, 2013 I agree. It depends on the coating. If it is alumina hydrate, and it falls on yor glazed ware,you will have white crudon the worst possible spor-like the rim of a teacup. You could always bisque your pots with the coating.-Ha Ha-I kid! TJR. Link to comment Share on other sites More sharing options...
Kristin_Gail Posted August 12, 2013 Author Report Share Posted August 12, 2013 I'm just using alumina hydrate / EPK, 50/50. It's all painted on now, so no fair telling me I should've used something else! Link to comment Share on other sites More sharing options...
Kristin_Gail Posted August 12, 2013 Author Report Share Posted August 12, 2013 So the reason to cook it on first is just in case it's going to fall off that very first time? Link to comment Share on other sites More sharing options...
TJR Posted August 12, 2013 Report Share Posted August 12, 2013 So the reason to cook it on first is just in case it's going to fall off that very first time? Yes. Alumina is very refractory. In other words, it melts at a high temperature. If it falls onto your glazed pots, you will have white crud. TJR. p.s. It was a good mix to apply. Basically kiln wash. Good luck with the firing. T. Link to comment Share on other sites More sharing options...
Mark C. Posted August 12, 2013 Report Share Posted August 12, 2013 I would run a bisque 1st in that kiln so its shrunk some before the glaze temp shrinks it more-that way you will also see how its adhering. I always bisque coatings on but thats me-You could also deck the whole load over with a top shelve to keep the stuff from dropping-we do that in our salt kiln always as well. That EPK will shrink a lot as its not calcined (bisqued 1st) you want it to hold the alumina which has zero sticking power. Mark Link to comment Share on other sites More sharing options...
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