Painless, and hopefully profitable for the cosplay crowd out there. I have to cast a large quantity of half-dollar sized dome jewels for Nia, and the experience has been kinda fun, so I thought I'd share it with you all. ^^
Thanks to HCC Cosplay for inspiring/instructing me to make them, though I found my own method, which is what this tutorial illustrates.
Aaaand thanks to ~spiked-stock, who pointed me in the direction of that site AND is keeping me sane while I make my Nia costume. x3 And is the best sewing teacher ever--I crashed her room for five hours the other night to make my skirt.
Hope this is helpful! Post if you have any questions!
I would imagine you can do that! Keep in mind that the resin produces an exothermic reaction, so the resin may stick to the silicone mold--just make sure you use lots of mold release or some other form of barrier, or in the worst case scenario destroy the mold to peel it off at the end. I would run a test first!
You can cut them once they get to the 'gummy' consistency (after about 7 or 8 hours!), I've done that~ You can't cut them while they're still liquid-based OR when they've totally cured, so just keep poking the back of them after they've solidified a bit!