QUOTE (sgarnett @ Feb 14 2009, 11:16 AM)
The Vette guys have to use the static-cling vinyl. Since out rear fenders are steel, magnetic numbers work. The small end of the legal size range for numbers and class letters will fit. You can get two 8" digits between the door and fender arch, with (barely) room for a leading 1 if you scoot them up a little higher. The class letters will fit over the fender arch. That still leaves some room behind the arch for sponsor magnets.
I have a black car, so on a really hot day the magnetic numbers may stick to the finish a little. Wax does not seem to help, but I lightly dust the back of the magnet with a dry teflon spray to keep it from sticking.
I have used magnetics as well (for AX) for quite a few years. They hold well and the required size can/does fit on the back quarter panels. Never had an issue with the numbers sticking but to help keep from getting minor surface scratches (on a dark car) I would strongly recommend keeping those areas waxed, wiping both the area on the car and the back of the magnetics before applying, wiping the magnetics after use and then storing them in some sort of protective sleeve (in a binder) ......but I'm a little anal
Seeing that your up North, another tip for when the magnetics are cold is to put them on the manifold when you get out to the event for a short bit (like waiting in line to register). This will help thenm to conform to the body panel curvature and thus hold much better.
I did give thought to the static cling type but you can only re-apply those so many times and then they are worthless ~ from my understanding. I've had my magnetics since 2001 and they still look and work as good as the day I purchased them (no telling how much I would have spent on static cling numbers by now)