I don't have any experience with the Flex-seal spray, but I will say to seal ANYTHING on the 5er that needs tape - I will be using GORILLA - waterproof patch and seal tape. Just be sure of one thing - get it on where you want it because you ain't taking it off. Comes with a backing so you can "dry" fit and then install.
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Steve & Lisa
2015 Montana High Country 353 RL | Sailuns | Kodiak Disc brakes
2015 F-350 DRW Crew Cab | Reese Goosebox
Retired and Lovin’ it!
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