Hi Jerry, welcome to the forum! Nobody here has recommended using black under orange.in my opinion, orange topcoat does not cover black well at all. To cover black with orange is a waste of paint!
Only mention of black in this thread was to have some on hand to mix with white to make a shade of light grey if one desired. Generally white is a good choice for most shades of orange. And welcome BTW.in my opinion, orange topcoat does not cover black well at all. To cover black with orange is a waste of paint!
Becareful spraying that white epoxy. It gives some people trouble. Need good lighting.