There are holes left by the factory in several seams that I have to seal before painting the inside. It took a lot of work to get the gravel out of the pocket at the lower R side of the pic, and between the arch & outer skin at the top R. The pocket can be filled with sealer, and the arches need a foam caulk-backer-rod laid over & pulled down to keep gravel out. I have no rust on the old body because I always rinse that area thoroughly after every wheeling trip, but I'd like some more protection...