The wall is begun that will separate the back half ot the head into two parts.
A closeup of the completed dam. Now a wall will be constructed to hold the silicone in place. When it cures, the wall and dam are removed, the silicone is cleaned and a release agent applied. Then a final wall is constructed and the final piece of the mold is poured, encasing the head completely in rubber that disassembles to allow the part inside of it to be removed.
the tail is prepared for molding. A wall is built to separate it into halves.
The first layer of brush-on silicone is applied to the tail. It is too big to go in the pressure chamber, so a different type of mold is built for it - one that will have the resin roto-cast inside of it instead of pressure cast. This means that instead of using pressure to eliminate air bubbles, I will pour a small amount of resin into this completed mold and then slosh it around inside the mold until it sets up, capturing all the detail inside the mold. Then the hollow tail will have a hole drilled in it and be filled completely with resin the rest of the way, so it becomes a solid object.
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