1. How old was your truck before it was painted? A couple of years of sun and weather can affect a paint job.
2. How extensibly did you detail your truck before the paint job? Did you detail your truck before? A simple wash and wax doesn't offer as much protection against paint wear as regularly detailing the finish with quality paint protection products. (Moreover, I'm not 100% sure that such care is a guarantee against fading - perhaps more experienced detailers can clarify).
3. Wet-sanding isn't the answer (I don't think), because there may still be a mismatch between the repainted section and the rest of the truck.
For what it's worth, from the pic you provided, the truck's paint looks great. Now please do something about those wheels and that bedliner!
You can tell in the pic even thought the exhaust is in some of it. I'll have to take another one tmw morning since you won't be able to tell when the sun is high up. The truck's actually 15 years old believe it or not and I used to wax it every so often with the required polishing in between but didn't want to polish it too much cuz I didn't want to thin out the paint. It was painted about 3 years ago and the finish on the original part is darker than the painted part, and would be suprised if it was the basecoat, but if it is, then that really sucks cuz those are my second set of stripes on the quarter panel and they are expensive. They don't make them anymore and most dealers don't have them in stock either. This is also a work truck which explains the bed which really is not that bad (it's never been detailed) and the wheels never have been polished. I was in the car business a couple years ago, but got out because it didn't work out. Now I'm in my old business cutting grass and the truck's used as a work truck hauling my mower and equipment- I don't even use a trailer although I'm looking for a classic truck to use. This will be retired soon.
