Eraser wheels are freakin' magic, I love them, but you have to be REALLY cautious regarding what kind of paint you lay them against. Factory non-lacquer paint they do awesome with. Anything that is already deemed to be sketchy, I would be very nervous. Also pay very close attention to the speed warnings. The 3M wheel for example I think has a max speed of 2K RPM. I noticed when using it for long periods it gets less effective the warmer it gets, so if I stopped and let the wheel cool off for a while it would work better again.
Richard