Not sure cause of the foil, but I normally use the bird's hairdryer for that, get it warm but not too warm and quickly work up an edge with a fingernail, then apply heat for a few seconds - not too close, then pull back a bit, heat, pull, heat, pull and they normally come off.
As for the foil and the fact it withstands lots of heat in use I can't say if it will work mate.