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I have a 2008 FF 189FBS and although I have no signs of any water leaks anywhere I went ahead and ordered a 50' roll of the 4" Eternabond Roof Sealeant.
Per their instructions and after watching the youtube videos I installed the tape over the existing sealant after cleaning the roof and sealant with acetone. (Caution don't inhale to much of this stuff when on your trailer roof unless you can fly)
The tape went down easily and formed a very tight bond with virgin roof on every joint. It did take some time and creative work with a exacto knife to get a good fit around all the odd shaped fixtures on the roof but I was very satisfied with the result.
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2011 Sanda Fe SE
2009 Mazda Speed 3
1993 Chevy PU
2007 Suzuki V-Strom 650
14 NRS RAft