P60G2
Scott is the expert. For what it's worth...
I got mine from a Denver SW Auto Paint supplier. As I prefer to mix it 1:2, I bought two gallons of catalyst. Almost finished the plane. Had to buy another batch. I sprayed Jet Flex SB interior. I got lucky and a pro pajnter happened to be in the store. Lots of tips. He still used it as a wash primer on aluminum.
I thought QB kits already had P60G2 primer but maybe that's changed now. Personally, I would find out exactly what was sprayed because not all products play well together. Contact the manufacturer and ask about compatibility, surface prep, etc.
That said, if I build another, I'll spray one paint as a primer/interior paint. Kirker EnduroPrime. 2K epoxy primer. Available in white, gray and black. Pretty easy to mix almost any neutral color. Shoot a fog and two medium coats. Keep some without catalyst for touch ups.