Post #489306 by Unkl Ian on Tue, Oct 20, 2009 9:15 PM

If you want to cast resin, then you need a flexible mold.
Silicone and Urethane are most common, but not inexpensive.
Latex is cheap, but takes a long time to make and breaks
down pretty quick in production.

http://www.smooth-on.com/howto.php

http://www.danperezstudios.com/workshop.htm

http://sculptorscorner.iespana.es/sculptorscorner/shiflett.htm

And don't forget to check on youtube.
Just about anything you want to learn is on there.