That joiner strip between panels!!
OK, so my camper is riddled with joiner strips, where the roof comes over and meets the wall, and the front cap comes to the roof and walls, and many more places. It looks like one inch material,...
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I pulled all of my aluminum trim strip and resealed it. Bought new plastic screw cover for everything, too. I almost got it all sealed. As you surmised, water can enter under the screw cover and migrates around and along the screws. I went back and sealed all the screws, adding a piece of Eternabond tape to the joint where the trim meets my metal roof. No more leaks.
If I was to do this again, I'd use a strip of Eternabond Doublestick tape under the aluminum trim. When you screw through it, it seals the screw and hole completely.
Video of Eternabond sealing with screw
If I was to do this again, I'd use a strip of Eternabond Doublestick tape under the aluminum trim. When you screw through it, it seals the screw and hole completely.
Video of Eternabond sealing with screw
