Once the shims have been painted over it can be difficult to remember what has fresh rubber on it and what doesn't. To solve this problem Steve adds inert blue chalk dust to the mix between layers. The cream areas visible have the fourth layer of rubber on them, and the blue areas are the fifth coat of rubber that is just being painted on. There will be one additional coat of rubber painted over the entire piece and then it is time to create the plaster and hemp "mother" mold. This will be a rigid plaster shell that fits over the rubber to provide support and stability when the wax is poured later on.
