Jim, I have used dicor for years....I have epdm roof on our bigfoot camper. It has never leaked because I do a lot of preventative maintenance using dicor.
Use: Dicor Sure-SealŪ White Acrylic Coating for application on the epdm...but you will also need to use Rubber Roof Primer / Cleaner
to clean the epdm before applying the acrylic coating.
I have also used: EPDM Rubber Roofing Lap Sealant where the fiberglass or plastic seam meets the epdm.
The website is:
You will have to call dicor to get the tel number of the nearest dealer...even then you may have to order these products. They are not sold at campingworld.