Hey Grimm, maybe before starting the paint job, try the heat gun!... My bumpers looked a little dull, so I used a heat gun and took my time, passing the heat gun over the bumper plastics really does bring them back to an origional color. I did mine probably about two years ago, spent about an hour going all around the truck, and they still look as good as the day I did them.

Just trying to throw out a simpler, cheaper option, heat gun at Harbor Freight, what, 20 to 30 bucks, and about an hour to do, compared to painting??? Just be sure to take your time, not get tooooooo close til you see how it works, cuz too close, you can melt the plastic with it! start further away than you think you need to be, and slowly move in closer, making sure to keep the heat gun moving , never staying on one spot.