Prepare the plaster add the plaster one spoonful at a time, like you were adding sifted flour to a cake mixture, across the whole surface of the water, to allow it to sink and soak evenly as it sits in the water (don’t just quickly “spoon” it in like you would sugar to a hot drink, as the plaster tends to clump in the water if you do this. Be patient and take your time getting your hands out, as you don’t want to tear the mould. It feels like your hand it stuck solid, but it is only held in there by suction and you will feel it gradually coming loose, as you wiggle and flex. If you are casting two (or more) hands holding, gently release your holds before removing one hand at a time, (ideally starting with the smallest hand, or the outside hands first, one at a time), to minimise the chances of tearing the mould. Loosen your hand by very slowly and gently flexing and wriggling your fingers and wrist. The colour changes from pink, to a pale pinky grey colour when hard. The alginate sets in about 3-5 minutes, depending on temperature of the water you use and the room temperature. Position the alginate solution somewhere you can comfortably hold your arm steady for the several minutes you’ll need to, while the alginate sets (I have found putting it on the seat of a chair, is a good height for me, personally). Next quickly transfer this pink solution to the 5L jug/container and then give the sides of the containera good bang to remove as many trapped air bubbles from the alginate as possible ( also bang it down on the counter a few times to try to release bubbles that way). Again, just to give a very rough guide, in the 5L jug I used here, I mixed 2.5L of cold tap water with about 600g of alginate. The electric wisk gets the mixing done as quickly as possible (don’t hang about - don’t mix for more than about 20-30 seconds or until the alginate has all gone into the water).
I use 4 parts water to 1 part of alginate (by weight) and mix using an electric wisk in a big bowl (the hardened alginate comes off the blades in hot soapy water). Next, get everything ready, before you start, because once mixed, the alginate solution sets hard in just a few minutes, so you need to work quickly. (By way of guide, it usually takes about 800mL of plaster solution to do a two (adult) handed cast, as shown in the photo below) The difference between the upper and lower levels (in mL) will give you roughly how much plaster solution you will need to fill it with. This lower level, gives you roughly how much alginate solution you’ll need for your life cast. Take your hand out and mark this lower level too. To get an idea of how much alginate and plaster solutions you will need, put your hand/whatever into the empty graduated jug/pop bottle, making sure it doesn’t touch the side or bottom and add water until it reached the top of where you want the cast to stop.
If you haven't used it before, here are a few tips that I learnt the hard way.įirst off get a container that you are going to use for your cast (I use a 5L jug for a typical two handed cast, but something like a big plastic pop bottle, with the top cut off, will do for a typical one handed cast). The alginate is safe (I think it is made from seaweed, though I could be wrong) and even smells rather nice. This is great fun and, if you prepare a bit before you start, very easy to use and gives very nice results.
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