Chris, you planning on taking them to a shop to get painted?
I'd just go with a rattle can. The duplicolor gunmetal that Larry used is nice, I've used it before as well.
If you WERE in fact thinking of taking them to a shop to get professionally painted, you'd be way better of getting them powder coated gunmetal. And a shop that does poder coat will have a lot of options to choose from.
when i did mine i used duplicolor gm storm gray. i have a tendency to graze a curb or too so its easy to match when touching up. i only have to do it like twice a year.
Chris I know its a longshot, but I love the gunmetal on my XXRs. And what about the oem hfp wheels lately?
Anthracite Metallic from the TLs are nice..... NH-643M
As close to gunmetal as I could think of, for Honda/Acura
Or you could just get the paint code for the gunmetal ASPEC wheels, paint them that color and keep it all OEM.
It actually MAY be Anthracite but I would check with Acura. Carries ASPECs matched her car almost perfect, and her car is AM.