On that 2" seam approx. 6" below rear window. (52 3100) The raised "hump" that goes horizontily (spelling) all the way from side door to side door- I realize that this section of cab was welded in at assembly but when painting, do u fill any crack between the seams or does the cab have to flex or expand/contract at that point? It just seems to me that the top edge is filled in and solid while the bottom edge may be left "open" (crack exposed) for some reason.
