I just received my order for 2 piece drop mold. ring #806143 and foot #80719. Has anyone used these? Need to know firing schedules for these molds and any helpful suggestions.

I recently fired some glass in my Jen Ken kiln and for the first time I am getting 1/2" bubbles in various areas of the pieces. I used 2 layers of glass, some with clear on top and some with clear on the bottom. I've adjusted the firing schedule to 300 to 1000F - hold .30 - 300 to 1450F - hold .10 - full to 960F - hold 1.30. Still getting bubbles. Never had this before - any suggestions to avoid these? Also, is there a way to save these pieces? I have pierced the bubbles - can I cover the glass with a layer of clear frit (medium) and refire?

Glass was all System 96 from Delphi. I have left the plate in the mold on the shelf and it has been cracking into more pieces every couple of days. Certainly was stressed in some way. Kinda interesting to check on. Never had this happen before.

My 12" system 96 white background plate with black opaque and transparent blue overlaid design came thru the full fused phase just fine. I cold worked the edges a little and then slumped into a shallow bowl form. Again looked good. I have a Jen kiln and followed the pre-programed firing schedules. However several days later the piece cracked across in the middle. It went thru anealing at 960 for 1hr and then left in kiln until room temp. What caused this? How to avoid it? Can I "fix" it by putting the two halves together and refiring it? Or can I break it up and use the pieces in another piece?