II would check with the paint experts and ask IF single stage ACRYLIC URETHANE is not better than single stage acrylic enamel? Close to same price I bet. I know the urethane uses a different hardner (activator). I just shot one car with e AU and another with AE both Shoplibe PPG products. I liked the results of the AU much better. I must have been tongue tied when I stood there and ordered it or the kid mixing misunderstood. I sure thought I said AU.