Gosh I have no clue, but my immediate response is "I'm not putting anything in my
tank that ends with car paint." However, it's certainly possible to do, although I guess my first impulse might be to say, why is it hard to stop the coil from resting on the tank? (Another thing I don't know much about so it may well be difficult enough to do that your idea is promising or whatever.
Good luck regardless of what you wind up doing.
Anna