Forton is a non-toxic, ultra strong, very hard, weatherproof and odorless material casting system (basically hyrdrocal supplemented with dry melamine, a liquid polymer, and fiberglas). Casting methods are essentially the same as urethane or polyester resin. FMG can be slush cast (hollow), hand laid-up, sprayed through the proper equipment or poured for solid casts. Repairs are easier to make when using FMG versus a casting made of polyester resin or epoxy, and Forton can be shaped with plaster tools.
The Pink House Studio sells Forton casting kits and supplies. The second link is a review and basic how-to of the process by a sculptor who does life casting. http://www.pinkhouse.com/Forton.html