Products on the lens or light source that obviously reduce the light's intensity or change its colour will become a reason for failure – applies to front/rear position lamps, registration plate lamps, stop lamps, rear fog and direction indicators,
Oh, also, i wouldn't buy the pre-cut Lamin X that you can get from Lamin-X USA. I'd just get the sheets of it from their UK website and then cut it to shape once you've got it on the car with no air bubbles/issues!