I talked to the American Eagle folks at Fleetwood and the Liquid Roof people and both said the roof on ours required the primer. I don't know about other types of rubber roof, I know many do not require the primer. Ours adhered well, its like it became an integral part of the existing roof there is no separation that I can see or feel anywhere. Ours was an Alpha Brand rubber roof is why we had to use primer. It's in a large warning on the can. I don't know if they use that kind now.
We had skylights with tons of old caulking and the skylights themselves were no good, I tried acetone and everything else and no go. Finally got a heat gun and worked carefully with it, that was the answer, it was 10 times easier with it and where I thought there was roofing loose and up in the caulk, it just turned out to be some kind of original caulk mixed in that was the devil to get off. I agree, I worked and worked to remove that stuff.
And yes it was a lot of work to spread. My husband did the main roof, I did the sides and around everything for him. We put the primer on and let it dry good and then did the roof several days later. If its very warm it sits up a lot quicker then it says it does. Took us all day to do a 38footer and almost into the evening.
Also he bought that tape with the 3 ft of plastic drop and taped everything off. He taped the edges down but a breeze came up and blew it into the primer in many places, we pulled it out for several hours, thankfully it wasn't in the finished product but we were sure upset. It came out ok, just make sure you really really tape that down to protect the sides.
Here's a couple of before and after.
It came out real good we think, but it was a lot of work. Since we also replaced all the skylights and the Maxx Air covers too and the vent tops ours came to $1600. Fleetwood had to special order that odd square middle skylight and it alone was $275, ouch dollars. Fantastic Fan sent us new domes for the old cracked ones of theirs for no charge. The only cover I did not have to replace was the fridge cover.
I don't really think much had been done to the roof other then slathering gunk on the skylights and poorly at that. Yes, we had a leak around the bathroom one we think, could be condensation, not sure, and the hallway. But luckily the unit had to have been stored under cover most of its life or it would likely have been ruined.
