On Tue, 22 May 2012 18:33:08 +0100, ARWadsworth wrote:
A slight problem with a spray on adhesive used on the backing boards for
an electric UFH mat caused the backing board to melt and stick to my
hands.

Best guess is it looks like melted polystyrene.

The meths has failed to clean it so I will drink that tonight:-)

Any other suggestions for cleaning the hands?

Angle grinder.