Had a leak in my roof from a roof vent. I went to an RV repair shop and asked about taping all of my roof seams with Eternabond. He said that is not the way to go. He wanted to do a $200.00 air test a...
Bumpy, by that line of thinking no one would replace a lousy charger converter with a better one, or cheap tires with good ones, etc. :)
I've used EB tape on the front and rear cap seams of two fivers and our B+. It's a very good additional seal over a problem-prone joint. The other roof joints seem easy enough to maintain with lap sealant.