Ok, I was asked to repair a curbed alloy on a 2009 megan.
I have only spent 1hour on this wheel, not including removing it.
As it arrived
Cleaned with bilberry
Prepped with 120, 240, 320 and whole wheel scotched and cleaned
Tacked off.
Primed with bog standard grey primer
Light rub with a foamed 800, then more primer
Tacked and a light dust coat of silver
And a few more heavy coats
Dusty coat of lacquer
1 heavy slowish coat of lacquer to finish it