Eight years ago my Winnebago fiberglass roof popped out of the aluminum track on the full length of driver’s side. I had not realized that they required periodic reseal maintenance. I as able to re-insert the fiberglass into the track and an RV repair service suggested Eternabond. I installed a 4” wide strip of Eternabond the full length of the roof (30’), pressed it to the roof fiberglass and around the aluminum track. Since then the only thing that has happened to it is tornado damage that poked a couple holes in it and a few scrapes on its surface covering. If installed correctly it really does the job.
Dave