Back in the 70's when I was doing lots of corvette/flatbottom painting, Evercoat made a product called feather fill. It was the first 2-part primer I ever used. Spraying lot's of lacquer back then and never had a lift or shrinkage problem. This was back in the days when we still used red cap. Feather fill was definitely high build compared to anything else at the time and at the time, is was the best stuff I'd ever used. Anymore, I would think the high build ppg/dupont stuff would be pretty similar.