I recently came across the Brick in the Yard Mold Supply YouTube Channel, which has well over a hundred videos on molding, casting and finishing techniques. I started off by watching this one on casting a rubber hammer. Brick in the Yard has been selling molding, casting and special effects supplies out of their shop in Texas since the mid-nineties, and their collection of videos give an in-depth look on how to use a lot of them. So check it out:
