I helped a co-worker build a Transformers mock up with a pair of the Maisto Solstice diecasts.
Laid down a flat white primer, then the pearl white as dry as I could stand, then laid on multiple coats of pearl clear.
Result was gorgeous, and it sold the project through. Client scooped up the white 'pre-transformed' Solstice for himself, or it was snitched out of the building in a matter of days.
Can't have nice things...