Thanks Golden_HVAC for your update. It's great that you took the time to do that.
IMO, anything that is hard when applied to a surface that will flex or twist is going to be a tough sell given enough time. I have an older 5'ver I leave down south and use in the winters. I've been using rubber roof coating which is easy to apply but may not have the longevity one would want.
I've heard the two part rubber roof coating eventually starts to crack and you will have the same issues as with the orginal rubber roof. Maybe the real answer is after 20 plus years the EPDM material should be ripped off, and replaced with new. No different then with a S&B.
