My thoughts: After having owned 5 other rigs and getting up on the roof twice a year with a caulk gun, I decided that I was going to find a better way. I am now a "senior citizen" and want to control some of my risks. So, I found out about Eternabond and it seemed like the hot ticket!
I "Eternabonded" my entire roof practically out of the factory door on my 27' FR Lexington GTS. It was easy and took about 7 hours (nice weekend project). Not cheap but I ordered the material off the internet and it was just a little over $30 for 4" roll of tape. I cut the tape to 2" for the windows. Did not use the entire 3 rolls I bought. Total with shipping around $125. Tool was around $15 but if you have strong arms/hands, you don't really need a tool but that can be tiring. Necessary, however, for windows.
Cost negligible considering the potential disastrous cost of an undetected and/or unrepaired leak. Add to that the prospect of "forgetting about semi-annual recaulking" and it's a no-brainer for me! I will continue to crawl up and do semi-annual inspections to make sure the seams are intact.
"Mostly" the Eternabond is holding up. A piece came loose in the New Mexico Wild Winds. Can't see why as the roof was cleaned and prepped and all other material adhered fine. Some bubbling of the tape in curvy areas around windows. (Yes, windows were also E-bonded as were the slide joint seams.)
"Some say that wine improves with age...I say that age improves with wine"
2013 Lacrosse 323RST TT
Towing Cassie the Dog, a privileged Bichon frise
Winters in FL--Summers in Northern CA