I have a Permatech liner in my bed and on my rocker panels and wheel wells. I've spilled lots of fluids on it (oil, diesel, gas, fuel conditioner) and have had no discoloration at all. I've been very happy with the Permatech liner. As said above the installer is the #1 consideration. I've had a Rhino liner in a previous truck and it was as durable as the permatech but definately had a color fading problem that the permatech has not had. I've also seen and had friends with line-x liners. Comparing the three the Rhino liner is the softest material, gouges the easiest and fades the most. The line-x is the hardest material, doesn't seem to have the fade problem, stuff slides around on it easier. The Permatech is right between the two - stuff doesn't slide very easy, it's easier to gouge than the line-x but not as easy as the Rhino, and it doesn't fade. Another consideration is that with the Permatech you can get custom colors that go all the way through the material, not just a top coat like the rhino - not sure about line-x on that one.