In short, no. Our company uses a Granite Deep Mat finish with a nominal dry film thickness of 27 microns and has four layers of durable textured finishes. After a long period of time, some 40 years, the colour will inevitably change slightly due to constant UV exposure. However, this process is so slow and gradual, that it is unlikely that there will ever be any significant colour change. The only visible colour change can occur due to airborne particles setting on your roof, especially if your house is in an area where there tends to be a lot of dust or minute debris from trees or plants. In these cases, a rainy day or a simple wash with a pressurized water hose will clean the roof quickly.