Post by johnscenedesign on Jul 14, 2018 11:48:07 GMT -5
As my resin is starting to set it starts to expand rapidly forming lots of air bubbles inside it and flows out of the opening in my silicone rubber mold like lava. I made several successful casts before it started doing this. I am casting outside and temperature has gone up from 73 to 83 - could that affect things? Could it be something else?
What you have there is foaming. Your last sentence tells me what might be the reason it foamed - the higher temperature probably has a bit of humidity added in and that humidity is probably what did it. I cast inside where the temperature is 70-72 with the AC on and fans going but I'll get a bad cast every so often if the humidity is up in the room. Resin likes heat but it needs to be a "dry" heat. If you cast outside, I would warm the mold first and maybe warm the resin too just in case. You might also have water condensation in the resin itself so warming it will help. Hope that helps.
Post by carol - Alumilite Corp on Jul 19, 2018 15:01:55 GMT -5
Notoes is absolutely right! I can give you an almost 100% guarantee that the humidity is your issue. With a small amount of moisture and/or introduction to something liquid/water based products you may get just some small porosity bubbles. In your instance with all the foaming it must be a lot of humidity involved.
Johnscenedesign, if at all possible best to store and use (caps on tight at all times on resin) in a climate controlled environment. If you can not do it inside, you must make sure it is very low humidity day.