I had a small scratch that turned into a bigger area through a few attempts at spot repair. I finally tried the spray can fix shooting a larger area. I followed the system directions of tape and paper definition of the area, primer, paint and clear with appropriate soray, coverage and coats. Within weeks, the area turned shaded and discolored. I don't have a fix and do not know where to go from here, other than have the door professionally shot. Any opinions?