As I understand things, the plastic headlight haze and yellowing is caused
mainly by UV exposure.  New headlight transparencies have a UV inhibiting
coating; but when that coating is gone/worn-out the hazing begins.  Unless a
new UV coating is applied after polishing, the freshly restored plastic
headlights will haze again in short order.  

For this reason. I never understood why folks were so enamored with
Euro-style headlights.  The old sealed beams didn't have the best light
pattern but when you replaced them you got a fresh filament, reflector, and
lens all in one shot.  And replacement sealed beams aren't expensive.  I
always believed it would be better to improve a few sealed-beam designs than
to develop hundreds of different plastic headlights with a short service
life and built-in replacement inventory problem.  I prefer an old, durable,
maintainable Mercedes over today's throw-away cars.  But now it seems
quality parts for my old Mercedes are even becoming hard to find.

Scott

> -----Original Message-----
> From: Dan Penoff via Mercedes
> Sent: Thursday, October 16, 2014 9:51 AM
> 
> What Rich says.
> 
> I have used the 3M kit for doing it by hand on the wife's 2005 Mazda 6 and
> the results are acceptable.  Just realize that once the plastic starts
breaking
> down there really little you can do about it. In other words, this is a
> temporary fix. They will cloud over again.
> 
> I do hers about every 3-4 months.
> 
> Dan
> 
> Sent from my iPad
> 


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