Casting the mirror frame in plaster of Paris wasn't really successful. I had the presumption upfront, but i just had to try it out. As you might have
seen the model is just too thin and too intricate for the brittle gypsum.
The company that supplied the silicon and plaster also has a few other poring media, so I've bought some resins. I've opted for Poly Urethane and got me a test kit of Acrylate in it as well.
The whole process is more or less the same as using plaster. Measuring and accurately weighing the individual components and making sure everything is ready and set. Cos of the short pot-life you only have a few minutes to poor.
The two different resins both took about an hour or so to set. Releasing the frames from the mold showed that the acrylate did not release any air bubbles during setting. It was shattered with really tiny pores and it wasn't strong enough, it looked a lot like plaster and broke... Turns out the poly urethane as first choice was a good one. It's perfect; it's strong & hard (tough as boots) and takes all the detailing!
I'll cast a few more and once they'll finished they will go on offer.
