silicone

Use Silicone to Make Casting Molds

Use Silicone to Make Casting Molds

Silicone block molds are a quick and easy way to make a whole bunch of the same thing.

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Flashback: No-Carve Stamps

Flashback: No-Carve Stamps

Ever wonder about the possibilities of designing your own stamps without having to carve anything? There is a simple way! You’ll need one ordinary household object – silicone caulking. Yes, the one you use on your bathtub, sinks, and windows!

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DIY casting silicone from caulk, pourable version

Our post from three weeks back about Instructables user mikey77’s “Oogoo” formulation generated some really great discussions in the comments. Now, reader Iceman086 has reported some successful experiments combining caulk, cornstarch and a solvent to make homebrew silicone with a pourable consistency. Perhaps we can call it “Ooze-oo?”

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How-To:  Make cheap castable silicone from caulk

How-To: Make cheap castable silicone from caulk

Turns out, though, that mixing in some cornstarch accelerates the drying process; just how much depends on how much starch you add. The author recommends starting with a 1:1 mix. I’m not sure about his explanation that the process works because the hygroscopic starch carries moisture into the internal volume of the silicone, but in any case there are probably other additives that will accelerate the process as well as or better than cornstarch. You might even find one that’s not opaque and allows for translucent castings.

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