Instructables

Mold Making: Glove Molds and Mother Molds

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Step 2: Silicone Top to Bottom

Picture of Silicone Top to Bottom
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Glove molding is great for low budget casting because it uses such a small amount of your major expense in mold making: silicone. Still, it takes a good deal of practice, trial, and error to perfect any mold making method. If you've never done a mold before it's best to try some small tests with objects you can find around the house before going whole hog and buying every mold making tool and toy. Also, there's a universe of videos on Youtube that show people going through the process of making good molds. Watch them and try to pick up the way the move, the way they handle materials, and all the little tricks that can mean a big difference to your end result. There's also a minimum cost involved in making something like this. Even though it's not too terribly expensive there aren't many ways to cut corners, here. You get what you pay for most times when it comes to fiberglass resins, silicones, and mold releases. If you care about details and how many copies you can get out of your mold, don't try and skimp on the quality of your materials.

So, to continue with the tutorial, our model is on a sheet of plastic that's going to catch all the drips and spills and such as we paint on our first layer of silicone. I sprayed a coat of release on my horns and donned some latex gloves. I own a pretty professional respirator to keep from inhaling fumes in my shop. If you don't have one make sure your workspace is especially well ventilated before opening up your silicone. It's not enormously toxic, but isn't something you want to be breathing in for hours on end.

I mixed up my silicone in a small cup according to the manufacturer's recommendations and began to paint it on my horns starting from top to bottom. When you do this make sure to go slowly and evenly letting the silicone push out bubbles as it travels down your model. Hunt around your model for any air bubbles that might have been trapped and see to them with your brush. Make sure you get under every overhang and into every crack. This coat is going to contain all of your detail. If it's full of bubbles then every part you cast will have bubbles and imperfections as well.
 
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al_packer4 years ago
Couldn't you use latex instead of silicone?
Yes. Latex is a lot slower though, because you have to apply thinner coats and allow each one to dry properly.
csiquet4 years ago
As for bubbles, I have already seen it is common use to vaccum the mixture (not just silicone) in order to get rid of the bubbles before.