I drive a red golf BJ 1994 color 3 in the vehicle license actually I would not have bought a red car, because red is typically not color-fast and the paint loses after sun exposure to color. Well, I got it cheaply the paint still looks like new to the roof. How do I make sure that this remains like this someone has experience with it?? How to clean the paint best. On the roof it looks like it is not quite color-fast. a corner there is a layer that you can get down. How and what do I do this ?? Someone has experience with this red varnish. For more than 10 years there are color-stable varnishes so those that keep their color largely. Gruss, Oliver