This video shows how to use the gelatin and glycerine mold-making material to make a mold. (You’ll find the actual recipe and mixing method in my previous post). For the model used for this mold, I used a scrap of clay I pulled out of my clay bucket. He’s a bit flat, and has no eyes, poor thing – but it worked well for the experiment.
The warm gelatin mixture did soften the Sargent Plastilina, but the clay hardened up again as the mold material was solidifying, so it didn’t seem to hurt anything. This modeling clay has a much lower melting point than most, so I did worry about it. But it worked just fine. And it’s so much less expensive than most oil-based modeling clays.
- As I mention in the video, you can’t use the gelatin mixture over unsealed WED clay. However, if you seal the model as I show in a previous post, it works just fine.
- And you can’t use the material as a brush-on mold, so it isn’t a good substitute for the Rebound 25 from the Smooth-on company. Sadly – that’s really nice stuff, but it’s so expensive!
But when I poured it over the half-face made with the oil-based clay, it worked really well. I did use a light film of petroleum jelly, just in case, but I’m not sure it was needed. I only pulled one plaster cloth copy from the mold, but I’m sure you could use it several times. You would need to be very careful to not wash the mold with hot water, of course, because that could melt the finer details. A small, lightly damp sponge would probably work if too many little bits of plaster are left behind when you pull your piece out of the mold.
This might be a cheap way to make a lot of blank masks for a Halloween-inspired workshop, and let the kids (or adults) finish them. If you happen to try that, make sure and tell us about it.You’ll be experimenting, of course. I am way too chicken to volunteer for something like that…
As I said in the video, I really don’t think this would work to reproduce paper mache masks. The wet paper mache sitting over the wet, yet solid, gelatin/glycerine mold would probably never dry all the way through. It may even stick permanently to the mold, the way my unsealed WED cat did. But I haven’t tried it, so I can’t know that for sure.
If you play around with this stuff, be sure to let us know what you think!