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> >UV light certainly gets through the glass, especially on > cars as old as > >ours. New car glass has some UV blocking built into it, but > we still use > > I think that the truth lies somewhere in the middle -- OK, I went to my favorite internet site for geeky science stuff, typed in the words "ultraviolet" and "glass" into the search engine and quickly found this: <http://www.madsci.org/posts/archives/aug97/866550494.Ph.r.html> The gist is that *some* UV radiation gets through automotive glass, even enough to tan a fair-skinned person like me. But I'd say the transmissivity of glass to UV radiation depends on the glass thickness and density. As glass becomes brittle over time, I guess it becomes less dense and hence allows more UV radiation in. Even so, I'll bet the tiny benefit of the expensive fancy sunscreen creams for car interiors is almost negligible compared to keeping the car interior as cool as possible. Park in the shade. Last summer I drove around with a folded towel draped over my uncracked dash. Yes, I'm a little paranoid about my dash. -Mark ------------------------------------------------------------------- Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe