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QUOTE (Graham Plowman @ 15 Jun 2009, 07:22) <{POST_SNAPBACK}>Personally, I wouldn't use polystyrene - it's flammable and gives off toxic fumes and some people say (although I've never had this experience because I don't use it), that it interferres with insulation on wires.

An alternative is styrene - similar to what florists use - you can get it from builders merchants. It does not leave those infernal "polyballs" that you find forever after cutting.

I think the"interferres with insulation on wires" is actually the fact that cables run within polystyrene or other insulations should be downrated because they can tend to overheat otherwise - basically, you generally use the next size up.
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