It is not possible to bond a plastic fuel can to a metal fuel tank. You can hook up all the metal wires and stuff you like, but the problem is that the static charge is distributed OVER the inner and outer surface of the can, and can arc from anywhere.
I've used plastic cans for years, but I absolutely will not use a plastic can to refuel an airplane when its cold. If it's warm out, maybe.
The difference between your lawnmower and your airplane, when it comes to fueling from plastic cans is the volume of fuel.
And, yes, there have been instances of pilots burning down their airplanes fueling from plastic cans.
This is like a lot of other issues, in that the problems are relatively rare, but when one happens, it WILL burn down your plane. And, in at least one case I know of, burn the heck out of the fueler as well.
Be careful out there, and don't fool yourself into thinking you can adequately bond a plastic can to an airplane for fueling.
MTV