i didnt even see this thread here. I painted my wheels on my MS3. I used high temp paint (gold) and metallic clear. As far as prep work, I cleaned,sanded.Then painted,re wet sanded (1500 grit), sprayed one more coat and cleared.
Heres a pic.
That looks awesome dude, good job.
I painted my 6's wheels with duplicolor's gunmetal color, I had a steel grey 6. It matched well and held up really well for 2 years.
Wet sanded, 3 coats each, 2 coats of clear.