I used the 6" wide on my old 2006 Holiday Rambler Presidential Suite about 9 yrs ago. Used it to seal both end caps, the fans and sunroof in the bathroom. When I got rid of it in August of 2015, never had a leak and still looked good. I used nothing but the eternabond.. also used on my slides lower area, on the DRV where people have issues with leaks.. NO WAY, do I ever have to do it again, NO WAY it'll leak.. bunch of places I don't need to caulk .
I'd go for it. I will use it on my roof as well.
Jim
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2016 Ram 3500 Longhorn DRW/CC/LB/AISIN/4.10/rear air assist.
2016 MS 36RSSB3/W/D/HD auto sat/slide toppers/IS/disc brakes
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