For the Apollo program, NASA helped develop a thin aluminum metalized film that reflected 95% of the radiant heat. A metalized film was used to protect spacecraft, equipment, and astronauts from thermal radiation or to retain heat in the extreme temperature fluctuations of space. The aluminum was vacuum-coated to a thin film and applied to the base of the Apollo landing vehicles. It was also used in numerous other NASA projects like the James Webb Space Telescope and Skylab. In the vacuum of space where temperatures can range from 250°F above to 400°F below zero and heat transfer is only by radiation. Radiant barrier is a Space Foundation Certified Space Technology(TM). Radiant barrier was inducted into the Space Technology Hall of Fame in 1996.

You should not paint your copper gutters, as this can damage the finish. Copper gutters are long-lasting and durable, which is the primary reason why people purchase them. From an aesthetic standpoint, the antique look that copper gutters provide is another selling point.

Using paint to cover the natural patina (green-blue algae formation) on the gutters can ruin the look for good. Once copper gutters have been painted, the scraping that is needed to restore them can damage the natural finish. Overall, you should only paint gutters that are made of aluminum, plastic, or vinyl, as they do not contain the same naturally rustic look that many homebuyers appreciate.