How To Make A Silicone Mold & Cast Plaster

As part of a larger project I needed to make a two part silicone mold. I'm making a mold of a cassette tape, but you can follow the same steps with virtually any object, but you'll need to modify the steps in order to suite your object. I'm using OOMOO-30, which is nice because it's fairly affordable, and comes in small quantities. There are more resilient forms you can buy from smooth-on and elsewhere that would be better suited for lots of casting. 

Below you can find the list of materials. You can find many of these in a craft/hobby shop as well.

List of Tools & Materials:

Smooth-on OMOO-30 Silicon:
Linocut Carving tools (Lot of options available, this is just one set):
Individual Carving tools:
Sulphur-free clay:
Clay sculpting tools:
Foam-core board (for mold box):
Mixing cups:
Glue gun:
Mold release:
Vaseline (cheaper than mold release, but might damage mold if used often):
Drop cloth:
Plaster of Paris:
Harder form of plaster:

*The amazon link are affiliate links, they don't cost you anything to use, but help keep my ink cans full.