Fiber Glass Dome
A fiberglass dome hut in Kelowna, BC, Canada with no interior insulation was coated on the outside with 15 mils/.375mm of TC Ceramic White.
The summer daytime outside temperature was 75F/24C, the interior was 65F/19C.
You will note there are no doors on this model. The dome became a cold sump with the TC not allowing the solar gain on the outside of the dome to heat up the interior.