an update on this as I was at the trailer this weekend and the weather cooperated.
I got as much of the old sealant off. 99% of it came off the rubber roof material and some remained on the aluminum lip/flashing that comes up from the back wall and curls over the rubber roof. I then cleaned the roof material as best i could with a brush and cleaner. then rinsed and let it dry completely.
I bought two tubes of the dicor lap sealant the EPDM stuff.
what I did notice is that each of the back corners on the roof are soft. in a triangle shape 4" - 5" out.
is there a better, more permanent fix to this without peeling back the roof? where they are soft they also sag down about 1/4" - 1/2" at the lowest spot in the corners. I filled the sags and actually laid probably 3 separate layers working my way out from the corners (or worst spots).
what does concern me is that maybe sooner than later this sealant will also lift and allow water in again.
is this something that I should really 'fill' somehow and use the eternabond over top of? I don't want the roof to look patched up all ghetto like .. but I also don't want it to leak, obviously.
I saw a friend using an aluminum patch panel and eternabond as well as a brush on sealer on his fathers aluminum roof.. it looked very permanent. the same patch panel would probably not be appropriate for the rubber roof I'm guessing?
where I work we sell aluminum patch panels for the sides of transport truck trailers and their roofs. they are finished in white one one size and are sticky on the other side.
thoughts? (and thanks again)
sorry, forgot to take pics..