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Does anyone have any tips on mixing small quantities of Hydrocal/Ultracal? As much as I love casting all sorts of oddball "things" for my daughters to paint/play with, it would be nice to know how I can mix up just 125mL if all I need is 125mL as opposed to mixing up four or five times what I need.

I was taught back in the day that in mixing large quantities for body casting or large volume casts to sift the plaster into the water until the "water won't take any more plaster" and a little mountain has formed just cresting the surface. At small quantities I'm finding I've always got too much water (I've been mixing in 'Red Solo Cups') and the little mountain plan isn't proving to be a consistently effective marker.

Received my first order of Delrin beads today and am excited to start moulding and casting head and body parts this weekend.

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I was taught that method of making a mountain of plaster in the water, too, back when I worked in a factory making plaster architectural ornaments back on the early 80s.Bbut it doesn't always work, even with bigger quantities. It's ok, you can add a little water or plaster in the early stages.
Put more plaster in the water than you think it needs. If it is too thick when you mix it up, add a little more water right away to get it right. With the denser, finely geound plasters like Ultracal or Hydrostone, a very small amount of extra water can make the difference, it's easy to go from too thick to tooo thin again. If it is too runny, you can also add in some more plaster if you do it right away. You might mix in a few more bubbles than you would if the plaster was left to soak up the water the way you are taught, but the plaster will still work.
You will end up with a bit more plaster than you meant to mix, but that's better than using a mix that is too runny.

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