I like the idea of silicone.

If I decide to ask someone who knows alot about rubbers I will take a trip up to brisbane.
They have a school for injection moulding and things of that nature.
It is called partec. I will just have to finish work early one day.

I will try to learn what I can before I bother to take time off work and go to partec.
I have already had a good chat with the owner of a rubber store near my house, He was very helpfull.
He has given me a few types of rubber to try for free, What a champ.
Neoprene has had the best results from what he gave me so far.
I have also had a talk the guys in the factory next to my work, They make and use injection moulds.
If I use rubber They suggested that I heat the rubber as much as I can and to leave it in the jig for as long as possible.