I am glad to talk with someone with a Jen-Ken kiln – what size do you have? My kiln is the AF3P 15/6. We recently replaced the thermocouple in our kiln. I did a piece on black irridized glass on the preprogrammed setting for a large project and it was perfect. Then did a piece on the same setting, same size of green and clear irrid that had bubbles. Not quite sure I understand why. Where on here do I find Pauls bubble squeeze?