Pigmentation of the colour thats caused that and not alot you can do even after a re-spray. Probably has alot of additive that makes it different from solid or clear over solid. I used to notice this ALOT with ford panther black after a month or two the colour was no longer deep it was faded underneath and not alot you can do but ask a painter to put less additive into colour as i found after alot of experementation thats tends to stop the bleed of colour