Whatever the color of the craft, its pigments will fade in the sun. In fact, not only paint, any color of dongdong in the big Sun may fade. At this point, the additive in the paint is very important. Such as light stabilizer, such as antioxidant or something. Unfortunately, good additives are expensive and expensive. Many times, the quality of the additive determines how the paint feels. It is certain that some kind of 2-year-old paint that has been noticeably faded is brighter than the new paint in 5 years. But in fact, there is no discoloration of the paint. Many times, the factory is more concerned about: evenly fade. Try not to make the different parts of the metal screen blind color.