Easy, but not a cheap fix, you can get away with locally re colouring where it's rubbed through, then re lacquering up to the edges, and along the swage line that runs from the rear window, to the rear light, using "soft edge masking foam" It could be done with rattle cans, but a bodyshop should easily be able to put it back to perfect for about 3hrs labour, and £60 paint/matrials
Thom