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Well I posted my idea on here a year ago and the headlight is still clear . No sign of peeling , yellowing , etc . My car is not garaged either . So I guess its doing the trick .

https://www.amazon.co.uk/dp/B008VPDP8K/ref=twister_B00W97IUEA?_encoding=UTF8&psc=1
Woodoc Food for Wood

I have used both before .

Get clear gloss yacht varnish . In the can the varnish looks slightly golden , however once applied and dried it is crystal clear . Usually I dilute it with mineral turpentine so its quite liquid ,...

I use only one UV sealer for my headlight restoration and it applies easily and lasts extremely long time . .......Yacht varnish .
Highly UV , water , salt resistant . Also does not crack or peel ....