So, I has some people express interest in how I cast my miniatures. The original are usually green stuff or gray stuff, and I sell resin casts of those.
The method I use for resin casting is very, very simple, and it comes from a guide a friend of mine sent to me. Apparently this guide is getting passed around the tabletop war-gaming crowd as a way to flesh out an army. From what I know, there it's a bit questionable legally when used for Warhammer 40K, Warmahordes, or any other licensed, copyrighted miniature, but I know it's perfectly legal when casting original sculpts.
That's okay with me though, cause I'm just casting my own creations. The guide, which can be found here, has several tips and tricks you can use to cheaply, and easily cast your own gaming army.
I personally use the silicone trick, and cast the miniatures in a fast curing, white casting resin acquired from my local Hobby Lobby. The detail has always come out great, although I've had purist insult my technique for not using RTV silicone for my models.
I find that a drop of acrylic hobby paint for every table spoon of pure silicone caulk will cure fast and strong, and using Vaseline thinned with mineral spirits provides an excellent mold release. I use injecting molding to make the casts, and usually find myself with minimal flashing to clean.
It's an easy process, and I highly recommend anyone with an interest in the hobby try it out sometime.