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Speed holes.
The only finish that can improve over a flat panel with wind flowing across it (your car's roof) would be a finish that incorporates longitudinal riblets, such as 3M's Scotchcal Drag Reduction Film. Good luck getting any of that though.
It's obviously more complicated than that since most panels curve and there are many little things that trip the boundary layer into vortexes which then reattach and stay attached around curves.
But that has nothing to do with the finish.
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