I've only used it once and it's great for German WWII armor. That's what was really used back then. So it's smooth and covers good. To me it kinda helps the panel lines stick out but that's just me.

This primer works good for a rust base. Very smooth

Many American cars left the factory with this color paint on most of chassis'. When you combine this with the other painted chassis parts you can archive excellent detailed results. For years I would paint everything on the chassis black. But by painting everything black, all of the chassis detail is lost on the model.