Today is the mold making day!

Following a tutorial on the Tap Plastics Website I have built molding boxes out of Lucite, and embed my figures halfway in plasticine.

Note the holes pressed into the plasticine. These will create registration keys to help keep the mold in line.
As I do not have my own personal vacuum chamber (yet) i am using a slow pour method to avoid air bubbles (another tip from Tap). Basically, you punch a hole in the bottom of your container and allow the rubber to ooze out. This stretches the rubber into a thin stream, effectively eliminating most of your bubbles.

The main problem with this method is that the stream is so thin that it will blow all over if there is the slightest air current in the room. Also note that the stream lands in the upper corner of the mold box – you never want the rubber to pour directly on the original. By allowing it to ooze over, there is less chance of any bubbles forming on the surface of the finished piece.