Dulled and discolored paint, scuffs and even scratches can all be eliminated, or at least brought up to the best level we can hope for. I begin with paint touch-up, allowing the paint to cure for a few days before approaching the paint job as a whole.
Here's some of my favorite finishing tools, along with various fine grades of wet/dry sandpaper. I approach any problem areas a with 5000-grit wet sanding, only going with coarser paper if necessary — this will take out many scuffs and light scratches. In the case of this project, the fuel tank was slightly discolored, with the white showing yellowing, probably from a combination of gas spills and years of UV damage. A combination of 3000-grit followed by 5000-grit brought the tank to an acceptable level. Great care and a fine touch is required — it doesn't take much to sand through the clear and color coats. It's easy to take paint off, impossible to put it back.
This leaves a dull finish which I tackle with an application of Meguiar's Mirror Glaze #83 with the dual-action polisher using a three- or four-inch pad, followed by Meguiar's Ultimate Compound. The final touch to any project is a hand application of Meguiar's Polish.
(click on an image to enlarge)
It doesn't fix the issue, but your eye is no longer drawn to the imperfection and the original seat is back on the bike.
Here, the metal (backside) washer, an OEM part still available, is combined with an outer nylon washer.
It's the little things.....