Hi all, my clay (red stoneware from Trinity Ceramic) seems to have had a really bad reaction to the Mayco Rose Quartz glaze. Major pin holes and bubbling. I have a similar piece of the same clay I was planning on doing in rose quartz but I don’t want to get a bad reaction again. Any suggestions?
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It says over application can cause surface issues???
I only did 3 coats. 
But maybe for this glaze…2 coats??? Try on a test cup or bowl
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Guessing too thick, could also be a reaction with that clay body?
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Refire it, it may work it self out. I’ve never heard of a reaction to the clay body, I’m going to file that one in the back of my mind to keep. It certainly is possible since clay has a lot of random organic and nonorganic materials. I was taught years and years ago this happens for one of 3 reasons.
- The clay did not completely gas out in the bisque fire. ( Underfired)
- Over glazing.
- Dust or other particles that cause a reaction or don’t burn out.
Post a pic after you refire please.
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A few people that saw me pick it up said that it could be a reaction to the clay off gassing the chemicals within it. I was told maybe to ask @jamierazzz as well as she’s very experienced with glazing.
I agree about the corpse Lily. I thought it looked liked it had a bad case of acne.
I’m making a few test tiles and I’ll see what happens and post results for those interested. I also read this can be avoided by laying with a clear glaze on top.
Yeah I’m going to try on some test tiles.
2 coats might help. I know that Amy likes the Mayco colors because she gets good color with just 2 coats. Amaco’s are definitely a 3 coat to get the pictured color.
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You may want to contact Mayco directly. I hear that they are very responsive to questions and issues from customers. You will need the lot information from the glaze bottle. Also, there is a Mayco Glaze group on Facebook; they may have some experience with this glaze.
Best of luck to you!
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Sometimes the bubbling and pinholing comes from not having quite a long enough time a final temperature. I once managed to fix the problem on a piece by adding a different glaze and refiring. I would suggest a glaze that tends to be slightly runny. It is possible the clay composition might contribute to the problem.
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I have RQ too and it goes on VERY thick. I’m happier with 2 coats OR mixing it with a running glaze. I’ve only used on white stoneware though. Second the recommendation to post in the FB group.
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Glaze issues can be a result of many, many factors - it’s such a thorny problem to tackle. As others have said it could be a glaze issue, an application issue, a clay issue or a firing issue or a combination of one or more things. From a firing perspective the bisque is slow and takes 15-16ish hour just to fire to cone 04. The glaze schedule we run is much faster firing to cone 6 in 8-9hours. It’s a very simple program and has worked with most glazes. It’s a large community of potters using a broad range of clays and glazes so it’s hard to find something that works every time for everybody.
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