hi, I came across the idea of using polystyrene as a moulding tool. what I figured is for certain parts 2 piece moulds might not be necessary. the part can be made out of polystyrene, wrapped with carbon fibre and once set the polystyrene can be dissolved with thinners, leaving a hopefully perfect one piece part. my question is where can I get polystyrene moulding material. im pretty sure I can buy the balls myself off the internet somewhere but that glue is used to hold it together to make boards etc...