I found a company that manufactures rubber localy and gave them a call,
They had a minimum spend of $500 for uncured rubber.
The guy I spoke with said it needed industrial machinery and a complex manfacturing process to cure it properly. (Not me in my back yard).

I asked an engineering mate that gets rubber and polyurethane poured regularly about having rubber poured, But he said that I would be better off with a sheet as I have been doing. It's just finding the correct material...

I had a rethink on how to find a suitable material...
I was trying to find a rubber that can be formed like a plastic.
I should have been looking for a plastic that is soft like rubber.
I think I have found a material that will do the job, "santoprene".

It will be a little while before I can give this a try as I just spent waaaay too much on yahoo yesterday.
so I need to build up some savings again. As I may be moving house in the near future.

If that fails I was also thinking of making a mould and having it sprayed in rhino lining, I got a sample from them a few months ago, it looks and feels like a stiff rubber,i think it would work well.


*Ivan*
I like that you have decided to have a go as well.
The material you are using looks like it forms very well.
How hot do you need the oven before you can form your material?