We stripped out three bedliner products last month. Two of them were DIY products. One was in a Hummer, the other in a truck. If you expose your DIY to the sun, they will tend to fade and deteriorate. Here are the pics of the DIY stuff:
Here's an after pic with LINE-X with Xtra (resists fading and loss of gloss). Keep it in the sun all you want, it will retain its color.