Depends on what look you want??Gold flake will work of course,but you could use silver,or rainbow flake-check out House of Kolors website!
My car has gold microflake over a bright gold base. I will say, the flake gave the color a very slight greenish tint. I like the result. Hope that helps.
I would say Gold flake if going over Gold paint, if your looking for a contrasting colour Purple flake looks good with Gold paint.
gold base, with silver and gold flake mix with a little pagan gold candy over that. the gold candy will pic up all 3 flakes.... the metallic,the silver flake and gold flake and it will glitter differnt shades of gold in the sun. more so then just one color flake.