Those headlight restoration kits are temporary solution only. I have used similar on A6 and it needs re-doing at least once a year. The plastic is coated with UV protective coating from factory. Ideally you would like to re-coat it with UV protective polyurethane coating similar to OEM once you rub it down something like or at least with UV clear-coat lacquer. Somethiong like this http://www.semproducts.com/refinish-...m-uv-clearcoat Without this UV rays get in the plastic and damage plastic itself.
Wax or resin from the restoration kits offer some protection from UV but it does not last for years.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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