Hi all! We are a family of glass blowers that have recently taken on the challenge of making key caps (Not an easy transition despite TONS of mold making knowledge already in place! MUCH respect to all the makers here!!) We are getting very close to some finished pieces but have run into a few hiccups, that we thought we would see if anyone here might be willing to share a bit of advice on. We are currently pouring the caps out of Urethane resins, and initially getting great results, but the last few pours have started getting bubbles all of a sudden. We think we have the change in environmental conditions narrowed down to an increased humidity in the last few days corresponding with the bubbles appearing, but have been running dehumidifiers in a cabinet with the caps while they cure. We have also tried heating the molds before use with somewhat better success but still have a bit of a problem. Are we missing something major or do we just need to keep playing with the humidity factor?
