A month ago I painted : 2 door handles, 1 side mirror 2 wiper/spray nozzles and the rear handle/bar/thingy. I sprayed 1xplastic primer, 3xprimer (wet-sanding in between), 4-5xcolour (wet sanding in between), 4xclear laquer (wet sanding in between). That´s how I did it, Result is quite ok, but the part of interest for you, really, is that I used 1 whole can of LKO (the colour). So.... If I were you, I would get 2 cans colour, should be plenty, good if you get the urge to colour code some more doo-hickeys.