I'm going to be squirting some red paint- well, actually, Garnet Maroon, on my '50 Olds, and I've been doing some reading regarding primer colors.
Previously, under some Honduras Maroon on another build, I had used oxide red primer, after discovering that gray primer on other parts and builds resulted in a very blunted, unattractive color.
The oxide red produced a nice color and looked really good. However, some people I've talked to suggest using white primer under reds is the better way to go.
I'm wondering if, like other colors, the choice of primer color should be dictated by the intended final color- in other words, a brighter red perhaps would look best over white primer, and maroons, burgundies, and darker red work well over oxide red primer.