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Actually, when properly done, painting improves aerodynamics, as all the imperfections are covered by a layer of paint. Painted and polished aircraft will have a better aerodynamics than a bare metal one.
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Sure I will buy that for the first couple of hours of flight.
When the paint cracks, scratches or chips from aeroelasticity though you will lose performance.
Remember too, using the Oberflächenschutzliste 8 Os 155:
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In case of needed puttying, (aircraft putty 7270.99) it should be applied on bare metal beyond the border lines of the paint scheme and the bare metal should be polished in the usual way but no camouflage on top of the putty.
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It is very doubtful bare metal would have just been left in a rough surface.