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You would be wasting your time painting the inside of the observatory.
The paint is acting as a reflective barrier not as an insulator.
I use Dulux "Silvasheen" which is an aluminium enamel paint for the roof and white paint elsewhere.
Silvasheen forms a mirror finish which is highly reflective.
Daytime temperatures are reduced by 3-5 degrees C in summer.
A word of warning. If your observatory is under a flight path make sure you are not violating any air safety codes.
Regards
Steven
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