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Hot!Headlamp surface coating problem

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JohnCRS PCGB Member
2021/07/20 15:41:11 (permalink)

Headlamp surface coating problem

Can anyone help with this puzzle please.
The picture below is taken from a 2016 GT4.  The headlamp coating appears to be damaged.  Both units are the same but they continue to be fully functional.  A register member has owned the car from new and is looking for any insights and, or,  assistance:
 - what could be the cause?
 - what to do about it?
The OPC and Porsche GB have not been able to comment on the cause but have offered a goodwill gesture:
'With us discounting the parts and labour, and with Porsche’s contribution, we have managed to reduce the cost for you down to £2286.68.' 
Cutting back and recoating the headlight's surface seems to be the only viable option.  Again, any thoughts and recommendations would be welcome.
Thanks, John

Attached Image(s)

Cayman Register Secretary:
Cayman 981 GTS (manual):
North Yorkshire (R3)

6 Replies

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Contraband PCGB Member
Re: Headlamp surface coating problem 2021/07/20 17:04:28 (permalink)
I’d pop the headlights out and see if they can be machine polished.
I‘ve seen crazed almost opaque headlights brought back to life before with polishing.
They could possibly be vinyl wrapped around the edges to hide the worst? (Desperate, yes, but it could work).
A reduced price of over £2k is ridiculous.

924 2.0 1982
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Allblack PCGB Member
Re: Headlamp surface coating problem 2021/07/20 18:24:19 (permalink)
I had a 997 when I lived in Cyprus that had the same problem, I used a headlamp restoration kit from Maguires brought them back like new and I think the cost was about a tenner.
The kit contained everything you will need apart from an electric drill, but be sure to remove the lamp units to do the polishing, it's far easier than trying to mask up the body and try to get someone to help, 1 to hold the lamp and the other to polish
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Scrounger PCGB Member
Re: Headlamp surface coating problem 2021/07/21 08:50:06 (permalink)
looking closely at your pictures it looks like the lens is quite badly scratched as well. Any ideas if this is something your friend has done or were they there already?
As already mentioned, a headlight restoration kit may well help as it will remove the existing UV coating and bring the lens to almost new. I would highly recommend them coating the lens with a UV protector or ceramic coating. 


North West (R5 & R18)
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JohnCRS PCGB Member
Re: Headlamp surface coating problem 2021/07/22 06:04:17 (permalink)
Thanks everyone.  We still cannot work out what caused it, but cutting back, polishing and recoating seems the way forward.

Cayman Register Secretary:
Cayman 981 GTS (manual):
North Yorkshire (R3)
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Motorhead PCGB Member
Re: Headlamp surface coating problem 2021/07/22 20:38:16 (permalink)
I reckon that we need the input of a material scientist/plastics expert here … unfortunately that rules me out!
Firstly, I assume that the Register Member hasn’t been over enthusiastic with a pressure washer. 
I believe that polycarbonate is the material used for the lenses and I assume that - as with glasses - a scratch resistant coating is applied for surface protection along with a UV protective coating and it these which have broken down. The scratches appear to be aligned with the airflow and therefore probably are due to erosion by road grit, and maybe vortices generated at the lens/wing interface combine with the grit to generate a scrubbing effect creating the damage shown in the photo in the darker area of the lens. Pure conjecture of course!
As said, probably it’s worth trying a machine polish followed by an appropriate surface protective treatment.

987.2 Cayman S
North Beds (R10 & R24)
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keiththo PCGB Member
Re: Headlamp surface coating problem 2021/07/26 10:08:37 (permalink)
I've noticed in the last few weeks the same problem on my 2015 car. I've not attempted to do anything about it yet as it seems quite minor at this stage.

2015 Cayman 981 2.7
2008 Boxster 987 2.7
1992 964 Carrera 4 Targa
1989 944 2.7
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