Check out Overman's Charity Wax - Carving & Modeling Wax Recipes and other cool stuff. You should find some good info to get you started. Here's a direct link to most of the wax recipes and info in PDF.Originally Posted by Davidh
Don't skip a tour of Gary's site, though, he probably has other cool stuff you may be interested in such as a Wax Injector, Gingery's Lathe, CNC Foam Mill, Gas Fired Crucible Furnace, Gingery's Electric Furnace, & instructions for Making Green Slime. Check it out!