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"
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