The way it was explained to me by an old school painter who I learned quite a bit off to paint my ute. Some paint colours (like my Absinth yellow ute) need a base (flattening) coat underneath as the paint is actually opaque and any different colours underneath with stick out like dogs nuts. I needed to flat coat mine with white. Darker colours need a darker flattening coat (depends on what effect you are chasing too). My burgundy 05 Adventra has a gold base under the paint, whereas the Commodore painted the same top colour has a silver flattening coat and looks quite different in the same light.
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