shawnhar Posted November 27, 2018 Report Share Posted November 27, 2018 I screwed up the glaze on my big bowls and need to start over, but the previous attempts at the studio yielded poor results after re-glazing. I had scrubbed those off with a sponge under running water, then let dry for days before dipping again. Any tips or tricks to removing glaze and starting over after you have dipped a piece in glaze the 1st time? Link to comment Share on other sites More sharing options...
Callie Beller Diesel Posted November 27, 2018 Report Share Posted November 27, 2018 Normally just washing off and drying sufficently before reapplying should work. When you say you got poor results, what specifically happened? Do you live in a humid area? Link to comment Share on other sites More sharing options...
shawnhar Posted November 27, 2018 Author Report Share Posted November 27, 2018 The glaze appeared to have come out thin and had small blisters. Maybe I should have dipped them longer than normal, or they got contaminated with studio dust and I didn't clean them sufficiently. I do live in a humid area. Link to comment Share on other sites More sharing options...
Gabby Posted November 27, 2018 Report Share Posted November 27, 2018 The glaze coming out thin sounds suspiciously like the bisque wasn't yet dry when you reglazed. Where I live it can be very damp, and large or thick things take forever to dry. My rule has become when I think it is dry, wait some more. Link to comment Share on other sites More sharing options...
Mark C. Posted November 27, 2018 Report Share Posted November 27, 2018 After washing make sure its dry-usually that takes days or you need heat. Link to comment Share on other sites More sharing options...
Callie Beller Diesel Posted November 27, 2018 Report Share Posted November 27, 2018 Agreed that the bisque was probably still damp, then. If you're pressed for time, or the atmosphere is just not cooperating, you could try putting the washed piece in a "dead" oven (one that's been turned off after being heated up and used), or just on the plate warmer setting for a few hours. I've heard of people using their barbecues, but I don't have any direct experience with that one. Link to comment Share on other sites More sharing options...
Mark C. Posted November 27, 2018 Report Share Posted November 27, 2018 I very rarely wash glaze off a piece. My shop sink has a 6 inch silicone rubber hose on end hanging down which I squeeze to get a strong stream of water and I blast off the glaze. Then I put piece up in heated shop for a day-for get about that day-(or in summer out in sun) fill kiln with other things-glaze that piece the next day or later in week.If its a small piece the heat can dry it that day but it has to be thin. Welcome to the school of hard knocks-its where we learn the most from our mistakes in ceramics-its a life long collage of sorts-everyone gets in for free and its just a matter of time before you start learning hard lessons Link to comment Share on other sites More sharing options...
oldlady Posted November 27, 2018 Report Share Posted November 27, 2018 the lowest temp on my household oven is 170 degrees f. i turn it on after putting work inside and turn it off after 10 minutes. my work is thinner than yours so it might take several cycles of 10 minute heat then leave it for half an hour or so. and repeat. Link to comment Share on other sites More sharing options...
shawnhar Posted November 27, 2018 Author Report Share Posted November 27, 2018 Thanks all! I have noticed my pieces are taking a lot longer to dry at the studio lately since it turned cooler and there are no doors open and fans running. Link to comment Share on other sites More sharing options...
Hulk Posted November 27, 2018 Report Share Posted November 27, 2018 "Welcome to the school of hard knocks-its where we learn the most from our mistakes in ceramics-its a life long collage of sorts-everyone gets in for free and its just a matter of time before you start learning hard lessons" Mistakes -> learnin', in Hotel California, yep on that. Link to comment Share on other sites More sharing options...
Stephen Posted November 27, 2018 Report Share Posted November 27, 2018 Have never had any luck washing off glazes. Have had some interesting effects from trying (some very cool and some not so much). I have surmised that bisque ware is porous and soaks in glaze and the residual after washing off still interacts with whatever I re-glaze with. It's only come of a few times in a decade and the last time was a platter and I thought it was very cool and interesting, my partner not so much. I think we will just keep doing it like we do and see what we end up with but I think in order to really start fresh maybe you got to soak for a while or something. Maybe Marks water blasting will take care of it. I did wash the platter pretty thoroughly and it still had residual that interacted and created kind of a frost coming up through a solid glaze. Link to comment Share on other sites More sharing options...
shawnhar Posted November 27, 2018 Author Report Share Posted November 27, 2018 Make sense Steven, the ones I washed off were not the same color as the rest of my bisque ware and I kind of thought the same thing. There has to be "some" residual glaze within the piece even after ardent washing right? Link to comment Share on other sites More sharing options...
liambesaw Posted November 27, 2018 Report Share Posted November 27, 2018 I've only had trouble if I tried to wash off and change glazes. If I am glazing the inside and outside of a mug in different colors and then get a blob I don't want running out of the mug onto the outside, I will wash it off "pretty well" and reglaze with no issue. I'm sure that varies between glazes and colorants but haven't had a problem. Link to comment Share on other sites More sharing options...
Callie Beller Diesel Posted November 28, 2018 Report Share Posted November 28, 2018 I agree that in many cases it's probably easier or less work just to make other one. If, for some reason you must try and rescue a mis-glazed piece, you might try scraping as much of the glaze as you can off the bisque first with some sort of plastic rib, like one of the yellow ones from Mud Tools. Follow up with a thorough wash. It could be that some residue remained from the previous glaze that didn't react well with the subsequent one. Link to comment Share on other sites More sharing options...
Rae Reich Posted November 28, 2018 Report Share Posted November 28, 2018 I use a stiff brush as well as water pressure. If you're going to apply a different glaze, you should probably plan to use a darker one, or one that has similar ingredients. Link to comment Share on other sites More sharing options...
Mack Posted August 9, 2020 Report Share Posted August 9, 2020 I will need to wash off a mistake from my bisqueware tomorrow AM, if I leave it outside in very hot weather will a few hours be long enough to wait then reglaze and put in kiln that late afternoon? Link to comment Share on other sites More sharing options...
LeeU Posted August 10, 2020 Report Share Posted August 10, 2020 I wouldn't take the risk with my kiln. Bisque is still porous., so firing a washed piece the next day is way too fast for the moisture to be assuredly gone. If it explodes it can wreak all kinds of havoc. Better to dry it thoroughly for a few days-especially if the piece is not really thin--and use a preheat program before going into the glaze program. It is also possible that the new glaze will be affected from reacting to the former glaze, even if it "looks" like the old glaze it is totally gone-it's not! Link to comment Share on other sites More sharing options...
liambesaw Posted August 10, 2020 Report Share Posted August 10, 2020 I routinely glaze fire wet bisque, never had an explosion. Explosion is a greenware thing. Link to comment Share on other sites More sharing options...
LeeU Posted August 12, 2020 Report Share Posted August 12, 2020 On 8/10/2020 at 7:53 PM, liambesaw said: Explosion is a greenware thing. Not only greenware !!! It did not happen with my bisque, but I can attest that it happened after glaze was washed off bisque & then reglazed & fired within 2 days. Link to comment Share on other sites More sharing options...
Mark C. Posted August 13, 2020 Report Share Posted August 13, 2020 On 8/9/2020 at 12:56 PM, Mack said: I will need to wash off a mistake from my bisqueware tomorrow AM, if I leave it outside in very hot weather will a few hours be long enough to wait then reglaze and put in kiln that late afternoon? YEs it will be fine Link to comment Share on other sites More sharing options...
Pres Posted August 14, 2020 Report Share Posted August 14, 2020 My biggest problem with washing glaze off, and then reglazing was that if I fired the glaze piece too soon I would end up with glaze defects like shivering where the glaze would raise from the surface, or even blistering. I have always found it best if washing and reglazing to wait an extra day before firing, especially in the hot humid summer weeks we have had here in PA, so take humidity into account. Err on the side of caution, and you will have no problems. best, Pres Link to comment Share on other sites More sharing options...
BlueSky Posted July 4, 2021 Report Share Posted July 4, 2021 On a similar topic: my glaze went on way too thick. Rookie mistake. (But I was smart enough to just fire one on a waste plate and it ran like crazy). Can I sand off some glaze? Or should I wash it off and start over? Link to comment Share on other sites More sharing options...
Bill Kielb Posted July 4, 2021 Report Share Posted July 4, 2021 1 hour ago, BlueSky said: Can I sand off some glaze? Or should I wash it off and start over? I would wash it off thoroughly. Even brush it if necessary then let it dry at least a day before reglazing. Sanding doesn't do it for me, besides creates more dust. Link to comment Share on other sites More sharing options...
BlueSky Posted July 4, 2021 Report Share Posted July 4, 2021 Thanks Bill. Done and drying! Link to comment Share on other sites More sharing options...
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