Smoked tail lights: film, paint or replace?

[wiirenet]

I had my tails smoked with spray paint in a can. Not sure what kind, but it was for smoking lights. We only did 3 coats, that's what the can said we should do max. And it doesn't look good. It just looks like the lights are dirty, they're not 'black.' I'm worried if I add more coats it will block out too much light. Plus I don't know what paint can was used.