Well 6 years NED now, and I am actually annoyed by having 2 basal cells removed from my neck. They are both on the left side of my neck(car drivers side) and so I am curious as to the actual rules on window tinting vs sunscreen. From what I've gathered so far, it doesn't matter how much windows are tinted as long as they have a plastic film. Is there any specific film that is best to use? if so, does it matter how dark the tinting is?