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Step 8Casting the gelatin
We now have a head (the positive mould), and a mask cast (the negative mould).
The method here is to heat up our prepared gelatin in the microwave until it is liquid (don't let it boil). You can use the raw or the foamed mixes. I would recommend that for this small mask you use the raw stuff, for larger masks and prosthetics try the foamed. Once the gelatin is melted in your jug (remember not to boil it), you are ready to pour.
Turn the negative mould on it's back so that the void is uppermost. Pour in the gelatin mix until the void is full, this will be more than the void needs so remember to do this where any spilled gelatin can be easily cleaned off and reused. I use a board covered in melamine (an old white kitchen cupboard door).
With the negative mould on its back, place the positive mould into the void and press the two together FIRMLY. Be careful since hot gelatin mix is liable to be squeezed out of the mould, you don't want the hot stuff all over your hands!
Force the two parts of the mould together gently but firmly until the positive and negative moulds fit snugly back together. I wrap some insulating tape around them at this stage to hold them in place.
You can either leave this arrangement overnight at room temperature to cure, or place it in the fridge if it will fit. Four hours in the fridge or overnight should ensure that the gelatin has set. Open the moulds gently and peel out your mask. If you are careful the moulds should make more than one mask.
The mask can be used immediately or chucked in the freezer for storage. Once you are bored with the mask, give a rinse to get any make up or paint off and then just melt it back down in the microwave and make summat else with it.
The method here is to heat up our prepared gelatin in the microwave until it is liquid (don't let it boil). You can use the raw or the foamed mixes. I would recommend that for this small mask you use the raw stuff, for larger masks and prosthetics try the foamed. Once the gelatin is melted in your jug (remember not to boil it), you are ready to pour.
Turn the negative mould on it's back so that the void is uppermost. Pour in the gelatin mix until the void is full, this will be more than the void needs so remember to do this where any spilled gelatin can be easily cleaned off and reused. I use a board covered in melamine (an old white kitchen cupboard door).
With the negative mould on its back, place the positive mould into the void and press the two together FIRMLY. Be careful since hot gelatin mix is liable to be squeezed out of the mould, you don't want the hot stuff all over your hands!
Force the two parts of the mould together gently but firmly until the positive and negative moulds fit snugly back together. I wrap some insulating tape around them at this stage to hold them in place.
You can either leave this arrangement overnight at room temperature to cure, or place it in the fridge if it will fit. Four hours in the fridge or overnight should ensure that the gelatin has set. Open the moulds gently and peel out your mask. If you are careful the moulds should make more than one mask.
The mask can be used immediately or chucked in the freezer for storage. Once you are bored with the mask, give a rinse to get any make up or paint off and then just melt it back down in the microwave and make summat else with it.
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Mar 17, 2011. 2:40 PMtimdomul
says:
for the foamed gelatine do you have to re-whisk the mixture, or does it stays "foamed"?
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27
Mar 17, 2011. 3:52 PM
marshon (author)
says:
marshon (author)
says:
Once 'set' it stays foamed. If re-melted numerous times it may need another whisk.
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Mar 17, 2011. 4:12 PMtimdomul
says:
ok thanks, and for demold do you use anything? or it pops off easily?
Reply
27
Mar 17, 2011. 11:27 PMmarshon (author)
says:
marshon (author)
says:
I have used plaster, alginate and RTV moulds and haven't needed to use a release agent. You just pull the gelatin out.
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