It's a bit of a pain to do it yourself but I went ahead and re-coated the roof on my old trailer. Like mentioned before, it's a two day job but worth it when you consider the average cost of having someone else do it at an average "Shop Rate" somewhere between $85-$120/hr.
I purchased an EPDM roof coating from Camping World (I did this about 8 years ago so I think the product was made by Carlisle(?).
Consisted of a cleaner/primer and a gallon of liquid EPDM material in a bright white. Required a good cleaning of the roof to remove all oxidized material, application of the primer and a rinse. When completely dry, then apply the EPDY with a roller. Difficult parts were working around A/C cover and all the vents. Took a lot of patience. If I were to do it again I'd rent a large garage so I could work in a covered space. It was hot, working on the roof during full sun. I figure I saved about a grand by doing it myself. Product itself wasn't cheap but it was in great shape when I sold my trailer after 6 years.
FWIW, if your edge trim/gutters are bedded in a putty like material, this would be a good time to remove, clean off all the sealer/putty and then replace AFTER re-coating the roof. In our environment in the PNW mold/mildew and even moss can start growing in this caulk/putty and by removing before coating then re-installing after roof has cured makes for a nice finished look.
"A wise man can change his mind. A fool never will."
"You only grow old when you run out of new things to do"
2018 Flagstaff Micro Lite 25BDS
2004 Nissan Titan