Hey, Im sculpting this half mask and then making a brush up silicone mould with fiberglass jacket and then using fast cast for casting. Im not sure if its better to mould it as one piece or should I divide it into three sections. Also what silicone is best for brush up mould? Thank you for any help/advices.

LIke fasta said, the silicone should be flexible enough to demould that no problem and have a 2 piece solid jacket for ease of use. 

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant