The skylight in my kitchen ceiling condensates in the winter, dripping water down the drywall and wrecking the paint around the opening of the skylight. My best solution is to seal off room air from reaching the skylight with a plastic sheet. May not look very nice. Suggestions?
The reason the skylight is dripping condensation is because it is not a very well insulated piece of glass. As such, it is very cold and when the warm air inside your home rises up to that glass, it is cooled, resulting in the condensation forming.
The best solution is to replace the skylight with one that is up to modern energy efficiency standards (insulated glass, low-e coating, etc.). Anything else is just prolonging the inevitable!