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The alginate is quite thick, and eve with swirling it can still have lumps. Remember that you have time, though, so don't be too quick to tell them to stop moving. I think my best ones were with those kids who I encouraged to play with it first. I've also done one where I dipped their hand in, had them wriggle for 15 seconds, then pulled it out and dipped it back in with their fingers completely spread apart. Then had them hold a shape. Taking it out and putting it back in seems to get rid of a lot of bubbles, and better coat the skin.Good luck!
I mounted the nut onto the screw, then embedded the nut in the casting. When I mounted it, I unscrewed the screw, put it through the base, then screwed it back in.By doing this I can mount it, or leave it freestanding. If I put the head into the casting, I couldn't let the hand stand up by itself without a base, and if my base were too thick or too thin it would be difficult to manage. So I put the nut inside the casting and then could choose whatever length of screw I needed to match the base thickness, or no screw at all to have the hand without the screw sticking out.
Item HYD from http://www.fxsupply.com/ - here's a direct link to the item: http://www.fxsupply.com/materials/plaster.html#hydrostone
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