Seems like most of the metal casting projects we feature are aluminum in sand molds, though ... and a handful of play sand is all you need to make custom parts.

In this episode Ben shows how to use silicone to make reusable mold for casting concrete. This is an easy process for making a concrete copy of an existing object. I used Mold Star 30 silicone ...

Pretty soon he was using silicone rubber to make two-piece, high-quality molds of lenses, good enough to try a few casting shots with epoxy resin. [Zach] ran into a few problems along the way ...

many car body parts are made from a mold, and these are just a few examples. Initiating a business that specializes in making manufacturing molds for clients is not a hard business to establish.