Mike, good luck on your project. I did nearly the exact same thing with my seven-spoke 16-17" OEM wheels. I summarized it here:
http://www.nsxprime.com/forum/showthread.php?t=154586
I used a sandable primer, but in hindsight, if I were to do it all over again I'd use some filler as well. The primer, while thick enough for very small blemishes, was not thick enough to fill in the chips in the paint very well. I would have been faster and would have come out better had I used some filler. I had to use very many coats to get it to fill in, and even at that, would have been better with filler.
That said, this is noticeable only when looking with a very discerning eye about a foot from the wheel. Anything further than that, say, standing in front of the wheel, and they look flawless.
BTW, I'm really happy with the color I chose, as I mention in the post they look silver in some light and gold in others.
Were you planning to remove the tires to do the work? I did and I found it made it easier to ensure the coverage on the edge of the wheel was adequate; I don't know that I could have done it as well having to mask the tires.
Let us know how your effort turns out.