Your stickers will be printed with extremely high calibre inks and are sealed with 3 thick coats of clear UV protective ink. That said, there is one undeniable truth when it comes to colour and direct sunlight exposure over long periods of time: colours fade. Retropilot stickers are very fade resistant. As a general rule of thumb, you can expect your stickers to resist fading for 3-5 years. The technical term is Photo Degradation. Some objects may be more prone to fading, such as dyed fabrics and watercolours. Other objects, like outdoor silk-screen printed stickers, reflect the light more which makes them less prone to fading. But over time and with direct exposure to ultraviolet light, eventually all colours fade. This is true for cars, space shuttles and stickers too. Some colours fade faster than others. Yellow tends to be the first colour to fade, followed by magenta, then cyan and although it will take a very long time, finally black.