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Keep building it up until your have got a good thickness that will not show the foam that will be underneath.

In this case I think I made it about 1 cm / 0.5" thick. I also put some elastic band into the silicone before it dried so the foam will have something to attach itself to.

I want the mouth to be empty so I can insert teeth or a tongue so here I have started to put water clay in the area that I want to be empty.

Just shape it so whatever you want to put in there will fit. Thinking backwards is never easy.

Now I think I got a good shape to it. You might need it to be deeper or something.

We will fill the mold
with a hard poly-urethane foam and poly foam's are not good friends with water so I need to cover the clay with plastic.

Now it's all nicely covered. I used a very thin plastic bag and it just attached itself to the clay.

As a special precaution I sprayed a bit of acrylic spray over too. Probably not needed but better safe than sorry.

Clay is in there and silicone in both halves. Time to put them together.

Strap it together hard.

Eehhh, yes it has been strapped now.
What should I do now???

You will notice that the edges of the neck will most likely fall down so put some gaffers tape to hold it in place.

Using spatulas, brushes and anything you can think of I put a silicone mix into the edge between the halves.
You need to have the exact same color of silicone as you had on the very first layer.

The first couple of layers of silicone I put in I keep fairly loose...

And the last couple of layers I make really thick using Cabosil or Plathix.

Fill it good! If you don't, it might break when you take it apart later.

Time to fill the mold
with hard foam.
My favourite foam is called R8 and I buy it from mold
life
from where I get most of my supplies.
No, I am not sponsored by them to advertise them but they are great and I recommend them as soon as I have a chance.

The R8 is a great foam. Very reliable and easy 50/50 mix.

Wear gloves!!! I can't stress this enough.
And have a exhaust fan to remove any fumes.
This is toxic shit!!
At least wear a mask (check the date on the filter!).
You will live a bit longer if you do.

I have put the mold
face down and I will fill the face above the clay. The R8 attaches very well to it self so don't worry about it coming apart later.

See how it rises. It grows something like 600% so don't mix too much. I think this first mix was 100 grams A and 100 grams B.

Mix up a new batch with 300 grams A and 300 grams B.
A normal head fills nicely on 800 grams total.

It grows quick!

And dries quick too.
I cut some pieces out after 15 minutes to show you how hard it gets quickly.

I slowly took the mold
s apart after about an hour.
I never rush this step. I really want to let it cure before I open the mold
s. The back came off easily.

The front stuck a bit and it took me quite a while to get it out.

Getting frustrated here after 15 minutes of pulling it very, very slowly.

So you can understand why I look happy to get the head out in one good looking piece.
(What I didn't show you here in the tutorial is the total failure head I did before this one)

Now just start digging out the water clay from the mouth. Be prepared that at this point it will start to feel a bit weird.

As I said weird...
Digging clay out of a dead man's mouth.

Here I am using a curved pair of scissors to trim away the flash edge. It is better to cut a deep canyon instead of just trying to keep it flat. It may sound strange but it is easier to fill a gap than to try to cover something that sticks out.

Once again you mix up a batch of original color silicone and make it fairly thick.

Look what a nice cut on the sides...

Now I use a dental spatula to fill in the cut.
Some people put some cling film over it but I didn't need to do it on this piece as it was a very clean cut.

This is after the first coat.

The second coat is now on and the edge is now quite invisible.
 
Paint time!
The head will now come alive for real.
I mix very small batches of silicone (1 g A+1 g B) on a piece of plexiglas and then I put a tiny bit of Kryolan grease paint into it.

Then I just use brushes, sponges and my fingers to apply it to the head.
Sometimes I want it more transparent and then I add a drop of heptane solvent. This also doubles your working time.
Without hepthane it will dry in a few minutes.

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