Curious- base coat vs acrylic urehane for base

Yes, single stage can be tough to flow out nice without getting some mottling (Non uniformed) in the metallic.It can be done for sure. Base goes on easy and the clearcoat is good if you need to do a repair on a panel. You can sand your spot repair and the rest of your panel in 1000 Grit. Then blend in your color and clear the whole panel. I think single stage is good for solid colors. I do it with Black cause I think it looks Blackest .