I'm just getting into this and have made two unsuccessful molds so far. I made a Pop mold that for some reason stayed soft, its a week old now. I can dig right into it with my fingernail. The pop was a few years old I had it around from another project, does it go bad? I'm going to try sealing it with epoxy to see if I can get a few out of it to make a multi cavity mold from something else, since the original sample broke when I cast the mold. I don't know why the Pop is soft.
My second attempt was to duplicate some worms that I like that Zoom no longer makes, I have about 8 left. So i decided to try a fiberglass resin mold. Glues 4 samples in a pyrex dish and mixed the resin according to the directions. Looked great when I poured it, I let it sit overnight. The next morning the mold cracked right down one of the worms. so now i have a one worm mold and the other half has 2 worms. Maybe I should try less hardner? I think it may have cured too fast for the thicknessof the mold and generated too much heat? Is that possible?
Lastly I have been using superglue gel to glue down the worms. Both times I had mold material creep around the samples. So now I have a lot of clean up around the edges. Not so bad with Pop but the resin is much harder. If I put too much glue it creeps out and I'm thinking it will leave a bad edge on the mold. How do you deal with this? Does liquid superglue work better?