I installed 3M's version of the clear plastic film on my H4 headlamps a couple
of years ago. This was upon the advice of a couple of people in the used parts
trade who had high praise for the protective film (no vested interest here, they
don't sell the stuff).

So far, the film hasn't yellowed or affected the light output from the
headlamps. Since installing the protective film, the H4 headlamps haven't been
broken or cracked, but then again...I've never broken a unprotected headlamp in
about a hundred years of driving. It's kinda like life insurance, you feel
better if you've got it.

Roy Olynick
'87 VW Westfalia GL
(till death do us part)
'91 Honda Civic SE
'01 Honda Civic LX
www.autobahn.mb.ca/~rrh/Westy_Home.htm
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