Many people will disagree but I hate that joint between the cap and the roof. When we purchased our 2019 331RL, the first thing I did when we got it home was apply a 4" wide strip of eternabond tape over that seam. I never have to worry about a leak at that weak point.
As already suggested, warm up the tape inside and dry and heat the roof with a blow dryer and apply it.
BTW..if you do this and it still leaks, it's probably the window?
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2019 Montana HC 331RL
2017 F250 Super Duty Crew Cab
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