I had considered a truck bed liner coating for the common issue of repairing the flaking clearcoat on the top of the front and rear caps and roof radius on the sides. However, I remember reading a member describing their plan to apply a colored film to that area since they were able to very closely color match it. Try doing a search. It wasn't more than a couple of months ago.
Some of these films can be durable and yet be able to be removed possibly without damage. I just bought some 3M film that they claim can be removed without leaving residue if done before 3 years. I'm putting it on the side bags of my motorcycle for visibility.
Jerry and Georgia
'03 Mountain Aire 38' on W22 (8.1 L gas)
2015 GMC Canyon All Terrain towed 4 down