It's a plastic world

Here's a blow-by-blow of my moldmaking work today. As mentioned before, I'm making two molds, both jaw pieces of the heads I've sculpted. I already showed you the application of silicone rubber over the models. Today, it's mothermold time.

First I trimmed the excess silicone rubber around the perimeter. Then I built a clay wall and covered it with tin foil. I applied Sonic-Wax, a toxic smelly wax, to the areas surrounding the trimmed silicone rubber. The Sonic-Wax will keep the Plasti-Paste from sticking to the wood platform. Then I mixed the 3-to-1 Plasti-Paste and applied it to one side of the silicone rubber.

After the first side dries in about 90 minutes, I'll peel away the clay wall and foil, then apply the Plasti-Paste to the other side. When that dries, I'll pull the whole thing apart, slice a seam along the ridge of the silicone mold and release the model. If I've done everything right, it should slip out easily and leave me with a hard-backed silicone mold in which I can cast more jaw pieces. If I've managed to commit any of the multitude of mistakes that can be made doing this, then I'll toss it all in the trash and find another hobby.

Maybe stamp collecting... or model trains. (Oh, wait a minute. I've already done model trains).