Hi. I’ve been working with wire melts for about 10 years. I always melt the glass into a fiber lined form and onto a base sheet of teckta 3 mil. Recently, I've started to use Bullseye 2 mil for the base glass. I’ve done this 3 times and my 1st attempt worked perfectly, but the last two have completely stuck to the shelf and cracked uniformily into a kazillion pieces.
My schedule is tried and true, no past problems. My top temperature is 1650 and I use Hotline High Fire kiln wash, applying 8 thin layers 1:5 ratio. My shelf is thoroughly dry before firing. I always sand and reprime my shelf after every use.
I have thought about using a thin irid as the base, but I would first like to understand what’s going wrong. I suspect that the thinner glass is the culprit, getting too hot before the melted glass above is flowing, but that doesn’t explain why my 1st attempt worked just fine.
Thanks to anyone who can help with this.