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How To Cast a Face in Plaster

Step 4Gloop the face

Gloop the face
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Slop some gloop on the castee's face. It will try to fall off. Push it back up. Obviously, be very careful around the nose area, both to avoid covering the nostrils and to make sure the bottom of the nose is covered as well as possible in the alginate.

Rub the alginate well into the eye cavities and eyebrows. Try not to leave any air bubbles between the face and the alginate. This is difficult as there is no way to tell by feel if there are air bubbles; your best bet is just to push the alginate around a lot. The eyes and eyebrows are the worst culprits for air bubbles. Little bubbles can be filled in after the mold is complete, but the skin texture will be lost so you want to do as little fixing as possible.

Push the gloop as close to the hairline as you can, especially at the center front. Also carry it well down onto the neck. It will try to fall into the castee's ears, as well; this isn't dangerous as it won't go into the ear canal without being pushed, but it makes a lot of people twitchy so prevent this if you can.

A good breakdown of responsibility between the two gloopers was to have one focus on the nose and eyes, and the other just slop the gloop everywhere else and keep picking it back up as it fell down.

Finally, remember that you have limited time, and that it is better despite everything to get the whole face covered even if it's a little uneven, than to get a perfect nose and eyes and have it set up before you can do the rest. You'll have a tiny amount of warning when it's going to set up, the consistency starts to get more cottage-cheesy, at which point you have between 30 and 60 seconds left.
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I'm a founding member of Noisebridge (https://noisebridge.net), a hackerspace in San Francisco, and Ace Monster Toys (http://acemonstertoys.org/), in Oakland. If you're in the area, stop by and say h...
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