i would recommend jellutong, it is what i used to make the shell mould for the car i built for my A level.
Once you have formed the shape coat it with P38 and when it has hardened rub it down with 1200 grit.
Oasis could not be put in a former.........
PVA glue will lose adhesion and become sticky under heat, it also isn't water proof.
Can i recommend a trip to the library or a visit to an adult learning centre.
Might also be worth getting a few GCSE Design and Technology text books all this was covered in the national curiculum when i was going through teacher training.
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