X2 what bwalton said.
Your description sounds like someone used Eternabond tape to seal it. Eternabond is excellent and is essentially a permanent repair. However if it's not done right you'll end up with what you currently have. I would redo the Eternabond tape, but make sure water isn't getting in a side seam or somewhere else before putting the new tape on. Best way to test it is to hose it down good and have someone inside to look for leaks.
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Chuck
2013 Jayco Jayfeather X20 E (sold)
2016 Chevy Silverado LTZ 2 Z71 Crew Cab (sold, and dearly missed)
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