Headlight Fixes? Any help out there?

[Guest]

I was wondering if anyone has tried to reseal the headlights on a S80? Both of mine fog up in rain and the car wash. I know this is from a leak in the lens housing. I have seen some lens sealer for sale out there on the net, but was wondering if anyone had tryed it. Is there a specific location where the lens seal seems to develop the crack and/or leak?