Originally Posted by booger78z28
... what now? lol...
First some questions.
Are you absolutely certain that the leaks are from your "thin spots"?
What do you base the "thin" spot assessment upon?
From my experience and research some EPDM membranes have a layered construction. That means that your membrane may have a white colored layer over a black layer of EPDM. The white layer can get thin while the black layer beneath is still serviceable and water tight. It appears that some RV roof membranes have that construction. Assessing membrane roof condition without previous experience can send you down the wrong path.
Perhaps it's time to get a professional inspection. But who to get? How many RV mechanics or sales people really have experience and can be considered roof experts?
Since you asked, I know what I would do.
Assuming an EPDM roof.
I would patch the "bad" areas using Eternabond tape. It comes in some pretty wide sizes. Be aware that the wider tape is a bit more finicky to apply because it needs to be kept in control to avoid wrinkles.
Why I wouldn't seal coat.
The sealer needs to be applied uniformly and bond correctly. It may bond well, but what if it doesn't? Once you coat the entire roof surface you can no longer properly inspect as the coating tends to hide problems and may interfere with patching even if you do pinpoint the problem(s).
If the EPDM is deteriorated to the point that spot patching is not practical then I think that you really are already to the point of option 2 replacement as mentioned previously. That said, remember that a layman may not be in a position to properly assess the situation.
I do need to disclose that my advice is based mostly om commercial EPDM roofing systems. I have only repaired a few travel trailer roofs to date. The basic experience should transfer though.
Perhaps some other members have experience and a recommendation for a tried and true sealer for an otherwise worn out roof? It certainly is tempting to just slop something on and walk away. Having never even seen your roof I certainly can't make the choice.