I had some clear resin from Alumilite lying around, and in a moment of craziness decided to see if I could rapid prototype a Dreamstone from a basic mold and cast process of the simplest variety.
Starting with the foam board I glued together from the last post, I manually cut down the edges with an Xacto blade to the best of my steady-hand ability (beer may have been required to steady that hand), and then used some clay to fill and roughly smooth down the edges.
Once done, I then whipped up a quick box, applied some Vaseline to the surface of the prototype gem shape as a release agent (it was lying nearby from a previous life cast I had done), and poured myself a concrete mold.
Not bad, not bad at all, but I could already see some potentially hazardous and troublesome undercuts, nonetheless I pressed on. I mixed up my clear resin, put a thin red wash of 'paint' in there, and 'Slush cast' the resin around the inside.
It was only a minute or two into this process that I realised I hadn't released the mold, which meant I'd probably be having a nightmare trying to get the resin cast out of this. It's OK, it's not like the release agent was nearby or anything, like a whopping mile or something... oh wait...
Well, that's what excitement and enthusiasm gets you, hasty mistakes! Either way I wasn't too bothered I was going fast anyway, just checking viability.
I was right, getting the resin cast out of there was a nightmare, and a feat of strength, but after a bit of warping it came out and i was able to roughly put it back into the right shape. Several things were apparent:
- A vacuum former would be awesome.
- The Vaseline layer that released the foam from the concrete was clearly too thick/course, and this transferred all the way to the final cast, the pattern was evident on the resin.
- In that regard, if casting in resin, I'd have to do a lot of work buffing the positive I was going to cast into almost perfect shape, or find some way of polishing the final cast down smooth.
- The colour transferred well, will have to go bolder, and look into resin dyes.
Good test, next time, I'll probably use wood, sanded down to good angles, followed by perhaps a filler layer smoothed down very fine, and topped with resin to give it a polished surface before casting. I'll use a spray release to prevent any unusual transfer, and slush cast as I did before.
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