thanks for the input guys. I can imagine why a silicone mould would be a drag to cure in but as you say it picks up and holds details better than ultra cal or whatever I used last time... I think it might have been hydra something :/
I also wanted to ask about the grp route, I wondered if anyone had ever used resin to slightly thin gelcoat and use that for the moulds beauty coat then start to layer up cloth, that way I could use that to try a silicone mask if I ever fancied it. Anyone have experience of latex drying in fibreglass moulds? I'm assuming it can be done as surely people arent swilling latex in giant torso moulds made from ultra cal etc are they???
again, thanks guys.