I have great respect for John's wisdom also.
I go back twelve years when we bought our trailer. At that time when it was only a month old, I spent a lot of time putting Eternabond on all of the seams and every penetration on the roof.
Lots of Eternabond on our roof. I have become a big fan of Eternabond. It shoows no sign of failing what-so-ever.
Over 75K plus miles and twelve years, we have been blessed by never having a leak.
So perhaps I should consider only coating the portion of the roof that does not have EBond.
Again, thanks to everyone who has kindly offered their opinions and help on this topic.