First let me say I think I can…but I want to make sure![^o)]
I have this OLD bottle of Testors enamel gold paint and it is still good from my perspective. My question is can I use the Testors thinner to thin and with my airbrush? I have an engine block that want to use it on.
If the piece you are going to paint is small I would brush it on or not spray it. Either way I recommend using a primer cost of white on the piece unless it is made of white plastic. Gold does not cover dark plastic pieces very well.
Actually, I find that “light” metallics such as silver, gold and aluminium look better on a dark base. As you may be aware, metallics have a transparent/translucent carrier to allow the metallic particles to show through, and the particular colour is imparted by tinting the carrier.
All things being equal, it shouldn’t matter what the underlying colour is if you apply sufficient thickness of the top coat to achieve complete coverage. However, if there is any “show through”, the light metallic particles contrast far better against black and it often appears brighter and more lustrous, than it does against white.
But anyway, that’s just my opinion - you may wish to do a comparison and see which you prefer. [:)]