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I painted my domes with Solacoat. The domes are clad with galvanised steel sheet. Solacoat is a special paint used on roofs which is highly reflective. Even under the summer sun the surface is cool to the touch as it doesn't retain any heat. It is expensive but does an amazing job. My observatory walls are made of brick which a lot of people disapprove of as it retains heat, but the Solacoat works great on the bricks as well.
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