The 5 YO roof on my Coleman is starting to show black across the trusses, which is the coating wearing off. Last fall when I washed and protected the roof I tried scrubbing to see if it was on top or ...
The EPDM roofing is black with a white coating. It isn't necessary to do anything unless you want to for cosmetic purposes. Millions of buildings exist around the world that never receive any treatment of the EPDM roofs. Those roofs still last 20 - 30 years or more.