ok. sorry for intruding again. I swear I'm not obsessed, I'm genuinely in that thinkering-process of getting my own wheels painted from black to gunmetal this spring. I might actually end up having to spend the time and do them myself also so all the info is rather interesting lately.
BFella is 100% spot-on. Here goes a video from a gentleman who also knows a trick or two. The basecoat color choice is important. Shocking in fact...
https://youtu.be/ONQxAKBRmms?t=155