I recently did the Eternabond tape on the front seal on my fiberglass roof. One thing I noticed as I removed the old trim is that most of the screws had been stripped. Also they had used self tapping sheet metal screws and those screws were only attached to the wood underlayment. So basically the only thing holding the front of the fiberglass roof down was the self leveling sealant put across the front seam. Now mine was pretty secure, but I can see how it would have been possible, had I left it alone, for the sealant to have eventually given away and air to get in under the roof and work to pull it up.
When I screw it back down, I threw away the only sheet metal trim piece, and bought a pretty thick piece of flat aluminum that stretched all the way across the rood. I drilled holes in it and used those to screw it back down. But before I did that I got up behind the TV and I was able to get access to about four feet of the underlayment, so I attached some pieces of white oak up there. Then I screwed the aluminum piece all the way through the underlayment and into that white oak. So now at least that center four feet of the front of the roof is screwed all the way down into that hardwood and is going nowhere. Then I sealed over the top of all that with the etrnabond tape.
