One thing I learned years back is make sure all your paint products are same brand and compatible with each other. I'm a little confused though, why would putting a urethane paint make lacquer primer lift? The other way around, putting lacquer on top of urethane might make it lift. Again I'm no expert, and have only sprayed 4 cars, 3 motorcycles. I used to use dupont lacquer primer, I think it was called 131, it's been a lot of years back. I sprayed single stage centari enamel or 2 stage base coat/ clear on top, never had a problem. Maybe your brand primer needs lacquer top coat! My two cents worth, Moose.
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