One of the biggest issues with restoring a car is the order in which things get done. You end up painting the car towards the end, but not quite at the end. As a result you still have stuff going on. Inevitably you'll damage the paint job. Like I've just done.
The car has been out of paint for 7 years at this point (yes it's still not done) and this is the first nick I've put into it. Fortunately this one I can buff out.