I just did a '38 Dodge panel in Apple Red candy. My best advise is to use a base color that is close to the shade of the cady... or darker, such as this customer wanted. His desire was for a color that was almost black until the light hit it.
You could go up to a medium shade of base, and still make it easier to spray... and to repair.
The problem in painting or repairing candies is that the base coat is usually lighter... then having any variation at all in the thickness of the candy will make that area lighter or darker than what is around it.
Try to find a base that is similar in shade (or darker) than the candy. Something like a darker tinted high-metallic gray or gold would help. The metallic will still light up when the angle is right, and offer that great candy contrast.
BTW... this base is black first... then three thin coats of a dark tinted HOK Metajules.