I'd actually two tone it. I'd keep the dark gray as it is, and paint the rest black.

But yeah I used 2ish cans of primer, 2-3 cans of black spray paint. I also sanded a little to get any chrome off, just to make paint stick better. 200 grit should be fine.. show us pics when you are done

 

Yeah, It's been raining non stop for like a month.