Donald,
This is another option.... It is a fiberglass marine deck paint made by Rustoleum and available at Lowe's. Below is a paste from an earlier post of mine and we are now at the 3 year point with this finish and it is still just fine surviving multiple pressure washings and absolutely no chalking. If you search on Rustoleum on this forum there is prep information and some photos. I have nothing against Dicor or Rhino Coat, just personally I would opt for a thin smooth gloss paint finsih that sheds dirt well and is easily recoated, if it is needed sometime down the road. These marine deck paints are designed just for that purpose. I do not know if these other coatings lend themselves well to being redone at some point. Maybe some users can fill us in on that issue.
We arrived home several days ago and decided to wash the motorhome (really needed it) which includes a roof wash. I have been keeping tabs for the folks on the forum as to how the Rustoleum Marine Deck Paint as a roof finish was holding up. We have now been through two very sunny summers spending time in Texas, New Mexico, and Arizona at temperatures over 100 degrees followed by some nights in the 30s up in the Tetons and all points in between. After 10k miles and five pressure washings there is still no oxidation, no peeling or delamination, and the finish has retained its gloss. After the first year I removed the original rather large footprint satellite system and it was easy to scuff the surface, solvent wash, and roller on several coats of the paint overlapping the existing paint edges that were ended at the original dish edge. One of the photos includes that area with a footprint of screws, residual wires, and lap sealant sealing the screw heads. You may need to click on a photo to enlarge it enough to see that. I cannot see where the paint lap was at this stage. That would indicate that any future painted surface repairs would blend in easily if that became necessary.
My net is that so far this roof finish has been trouble free and easy to clean. Keep you posted next fall...
Later Ed