About how long did it take? Did you have the fogs on for a single long time or was it cumulative over time. I've had the Xpel on since 4-06 and it looks fine, but I don't really use my fogs very often.I generally believe you shouldn't use the fogs unless there is really a visibility issue: fog, rain, or some type of poor visibility where you really need to locate where the edge of the road is. Not like Pontiac drivers who always have their fogs on no matter what. Sorry if that is a stereotype, but it's not too far off base. I believe that if you don't need them, then leave them off since they do diminish the vision of oncoming traffic to some extant.