I did like a couple of others on the forum did with their wheels & painted my barrels, calipers & rotors last week.
I did not use the G2 system. I used what I found worked very well when I had my 82 coupe, POR15. It comes as a very complete kit & is easy to apply.
I bought a kit for red, a kit for black, & a 2nd 8 oz. can of black, which I just started dipping into when doing the 2nd coat.
I put 2 coats on everything & when it came to the caliper lettering, the chap stick "trick" did not work so I took a razor & ever so slightly slid the blade down the sides of the letters to cut the excess paint off & clean up the letters.
Did mine a couple of weeks ago, on my Blk GS. I went with PPG black base (2coats) and 3 coats of clear. Sprayed with low pressure, high velocity gun. Rattle can VHT high temp on the rotor hats, kept calipers grey. Love the look, but now just hose the brake dust off the barrels