I was looking at my truck the other day . Noticed that everywhere there was a scratch in the repaint it was peeling away from the original paint . So I helped it along on the drivers side . I was able to strip the paint of easily with a razor while leaving the sealer/primer . Lots of sanding starting with 800 worked all the way up to 2000. Buffed with ultra cut compound work it up to polish then wax . In 3 days I got 3/4 of the truck done . This is the patina look everyone is trying to get