chops1sc wrote:
The spots under the rack flanges are white rubber. I'll get a picture after work.
What you are seeing is the white surface coat of your roof sloughing off and exposing the black base coat of the rubber that is why you still see white under the rack flanges which were not exposed to the elements. My friend has a 1996 Bounder with an EPDM rubber roof that is almost entirely black. I have the same year GBM that looks like yours. I coated mine in 2006 with Kool Seal that I got from a friend who bought a new MH with a FG roof. It looked white for about 4 years until it started sloughing off then showed the dark spots underneath. I only had enough for one primer coat and one final coat. I will eventually recoat the roof if I decide to keep it any longer only to reflect the sun's rays to keep the inside temps down.