I vote plastidip. I did my jeep WK roof and it came out fantastic. Matte black on silver. The roof is easy because it's mostly flat and doesn't run so the spray dries evenly which is the most important part. I'm going on over a year without it even peeling a bit as long as you tell the car wash not to rub it when they dry the car. Plastidip first for about $30 worth of cans and see if you even like the black look. If you do but really want the best quality, then go invest in something more professional but you might be surprised how impressed you'll be with a black roof and a full wallet (less $30).
Just my two cents...
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'13 328xi M-Sport
Black Sapphire Metallic, M Sport, Technology, Lighting Package, DHP, Harmon Kardon, Sport Auto, Heated Front Seats
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