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What about coating the inside of the dome with a low heat capacity insulating material , that way water vapor will not be able to give up its latent heat to the surface to become liquid water.maybe a thin layer of polyurethane foam sheet or similar would do. The inside of my observatory roof is lined with aerocell insulation to help insulate from the summers heat , it never attracts condensation. Good ventilation is also important if the source of moisture is internal , perhaps one of those rotating vents you see on the sides of trailers/caravans attached to the side of the observatory would help.
Philip
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