about a year ago, I needed to have some repairs done on the aftermarket body kit on my Q45. It was going to run $1000 just to repaint the whole bumpers.
The repair area was small but the paint guy said he couldnt quarantee the match unless he did the whole bumper.
I seasrched the web and found this company
Automotivetouchup.com Touch Up Paint, Aerosol Spray Paint and Paint Touch Up Accessories
Microfinish LLC in louisianna. they mix custom 12 oz aerosol cans to match the paint code. I ordered a couple of cans and was VERY pleased with the result. It matched!!
It's $20 bucks a can but in my opinion, it is well worth it.