Two more bits of input:
1) I know three coach owners that had Buskote applied to their rooftop's, and their skylights. It reduces heat gain quite a bit, and hinders light input by estimates of 25-35%. (Per the owners, as I asked them.)
2) When we had our Solar Panels installed, I had a roof top rack installed, and four out of our five panels are mounted on the rack. They straddle there solar dome. No noise from rain, or hail. Light reduced 45-55%, depending upon the angle of the sun. (And I admit, the wife would have liked more sun to come in.) Solar heat gain is non existent. And, I feel the panels above add some insulation value, and help reduce heat loss in cold weather.
Prior that, I used either 303 or Zaino ZCS, depending what I had at any given time, to reduce UV impact.
And good caution to make sure if you do put a paint on the topside, that it is compatible with plastic.
Best to all,
Roo II is our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...