I have line-x in the bed of my 06 pickup. the truck isn't garaged and is in the sun most of the day (when we get to see the sun...) No discoloration yet. It's two years old next week. I'm very happy with how it's held up. I torture it pretty much every weekend and no problems so far. It's pretty tough. I wish they had put the last spray on a little heavier though. It gets pretty slippery.