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Thanks for the replies and suggestions.
The dome itself is plywood - white on the outside and black inside. The building is clad with white mini-orb, and insulated for the most part. I haven't had any condensation to speak of on the inside of either of those surfaces.
The shutter is new and is a single layer of "sign white" (standard material for sign writers, I understand), which is about 0.5 mm steel that comes painted white on both sides.
I have some spare sisalation that I could try, but I may also chase up the type of insulation that Peter used.
So far, I've only noticed condensation on the shutter when the obs is closed, however, it is what may be called well-ventilated. The shutter is not at all a "tight" fit, which may have its pros and cons. In hot weather, I expect that the heat will not build up quite so much.
Cheers,
Chris
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