Originally Posted by pinholecam

It won't matter if you will have many coats of the main color.
If its few layers, the base color will affect the tone of the color on top.

Because the base coat was almost enamel like hard, (mine was a white bike), I basically left that on and sprayed my color over that.
The advantage of black will be that in the even of a scratch and the base color holds, black is usually less obvious.