[chrisguyw]

Hi Jeremy, A quick shot of primer , would be a good idea when using any paint formulated for plastic, when used on alu. wheels.......additionally, you may well find you get better results if you use a spray for your colour coat............"Sharpies"/Marker pens,.....well it depends on whether you want you wheels to look good or not 

Use some toothpicks or wooden skewers (as axles) when painting your wheels.

Cheers
Chris Walker

PS If you do like black wheels, Staffs' make a bunch of colours (incl. black)

Lots of the actual cars from the 50's/60's had completely painted wheels, not the polished rims more commonly seen with the later cars.