Casting the sculpt.

Last time we talked about sculpting, now at this stage we need to move on and cast the sculpt.

To do this you need a few things:-

Plaster of Paris
Mod Rock
Some Water Clay
mould release
Vaseline
more oil/plasticine clay

To begin with, you need to build flashing, this is the plasticine all round leaving a small white rim of plaster showing, all areas that have plaster showing must be flashed.

ensure you leave the keys free as this enables separation from the plaster of Paris.

Now on all areas that the plaster is showing. put Vaseline on, I used a cotton bud and a covered the open areas with a good amount. 

Now build your wall if clay, make it water tight as you will be pouring plaster in to this to create your mould.

Once built you can fill with plaster, then wrap mod rock around the clay to give it added strength

Before you put your plaster on the sculpt check 2 things

1. have you put vaseline on all the white areas?

2. have I sprayed mould release on to the mould!

these are imperative.

At this stage you need to let it set, it is worth noting that your sculpt will undoubtedly be destroyed by the process. 

 then once finished, take a blunt instrument and loosen the edges around to break vacuum, this then releases your mould of your cast. 

I don't have images as I was alone and couldn't take them while getting my mould free.

once free you need to get white spirit and some cotton wool and clean out your cast as well as remove all the clay from your original cast and clean her up too, these will now be used as a mould for the foam latex front and back, meaning, putting foam latex in to the prosthetic appliance mould that you sculpted and pushing the face you cast of your model, ,making it a perfect fit for them.