I have long wanted to build one of these, probably lowered in the weeds with an SCCA look to it. I always thought the body design was very handsome and with it low with the nose a bit lower, they really look slick.
I think I would just switch to Tamiya spray can primer and probably clear too. just a suggestion it might be easier than messing with all the variables you got going. shame to ruin the body of such a beautiful project.