These are 25 tutorials on various methods that can be used in casting molds. Obviously, since that they are all from the Alumite company website they use their own materials.
However, there is so much that can be learned from each tutorial. It's a very useful skill to have in your toolbox when making any kind of prop or whenever you need a copy of an original item that can't be tossed about on film set. Check it out. (via Haunt Project)