What kind of material polystyrene/styrofoam is electrically? Could I make a secondary form from polystyrene? Is it better/ worse than PVC pipe? I can easily get different types of polystyrene: -white-colored (high, mid and low density) -blue-colored (only high density - very hard!) I have also a suitable "hot-wire" cutting machine. (I make wings to radio-controlled planes) Tomi (beginner)