Thanks for the sensible suggestions. Went OW this morning and tried Plum's tactic of getting it wet first and all I can say is that it was like wrestling with a wet kipper. There was no way it was even going to get on my head, let alone stay there
.
Will try the talc option tomorrow.
Saffers - i end up looking like a chicken with a flappy bit of latex on the crown of my head. Not an attractive look when you're trying to pull any of the Hunks In Trunks.
On a positive note and totally unconnected with this thread, I wore my pool goggles to the lake and they did not leak at all
so will be ditching the full-face jobby-things