I would agree with Iwritecode, I would think it is a bad idea. The roofs are rubber and spraying anything like that on changes the properties of it. In addition, I may be wrong but I always thought white reflects heat?
Why change it to silver if white is already reflecting the heat, this is from the national science foundation "A white object reflects all wavelengths of light, so the light is not converted into heat and the temperature of the object does not increase noticeably"
2015 Forest River EVO 2850
2012 Dodge Ram 2500 6.7 Cummins
Yamaha 2k x 2 with parallel cable
EMS 30 PI portable w/ Edison plug
Nights Camped (2016-13) (2015-13)