On Jan 9, 12:24*pm, "Dave" wrote:
I bought one of these little rascals that help you to do mitres in the stuffhttp://tinyurl.com/yzhmpor(link goes to Axminster tools) but what's the
best implement to actually cut polystyrene coving with? Wood saw? Hacksaw?
Bread knife? Something else?

Have you thought about the risk of polystyrene in the event of fire?
Breathing in fumes from that stuff would be fatal if you were trying
to get out the house in a hurry. IMO, it looks sh*te compared to
plasterboard based coving even when painted.

Dave.