Skylarking
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In the past I haven’t been able to find much info about what the headlight OEM’s actually use but I suspect it’s some form of UV resistant Diamond Like Coating (similar to what BlueRays use to provide abrasion resistance).It’s not 2K on the lens. It’s the UV protective coating. Has to be sanded off.
One thread on the www did mention the following which in Mythbusters parlance sounds plausible to me
Headlight Coating Options?
I seem to have an excess of free time lately so I've decided to 'restore' the leadlight lenses on our 2014 Accord. I'm comfortable with the
www.autogeekonline.net
Ceramic coatings have an average thickness of between 0.5-1.5 microns while new OEM factory headlamps have a hardcoat thickness of 8-18 microns. Factory hardcoats also adhere to specific DOT requirements for UV, abrasion and chemical resistance. These are commercial grade hardcoats that get applied in a cleanroom and are UV cured. There really aren't any consumer grade products that can duplicate this in the field.
Some non paint stuff seems to be available but seems pricy and complex to use
Optimum Opti-Lens Headlight coating (5-6 sets of headlights)
Protect your headlights with Optimum Opti-Lens Headlight Coating - the most advanced polymer system for maximum bonding and protection. Shop now!
detailingshed.com.au
but one OEM solution is outlined below
Openair-Plasma® | For Headlights | Plasmatreat
Plasmatreat's Openair-Plasma® technology provides a cost-effective and reliable way to bond headlights and tail lights. Contact us to know more.
www.plasmatreat.com
So I think 2k is still the best alternative for us owners to use a.t.m