[BusNit]

Tom, I used this product from Amazon. It worked great however where I used it was on the aluminum side moldings. Newell used 3M tape and screws to secure those trims on my year. Once I had the coach painted, the difference in metal thickness caused some pulling of the paint from the different temperature swings. Not sure if that would be an issue with yours. I see why they used something "flexible" to prevent the two metal's from contracting at different rates. Either way, that adhesive is some strong stuff. If you can put some VHB tape in the gap, that may work good too otherwise this stuff is excellent and permanent.

https://www.amazon.com/gp/product/B000PE...UTF8&psc=1