I've been toying with the idea of sculpting plastic stuff for a while now (not necessarily for Transformers, but, if I can get started, who knows?). What I need is plastic-type moulding stuff. I'm uncertain of how to describe it better. The first substance I need is something to make a mould from that can be reused (for multiple copies). The second substance I need is a slow-setting liquid plastic that dries hard. This is to pour into the mould. I live in Australia, so it has to be stuff I can find here.