I used the yellow tinted Xpel on Cibie e-code 5" highbeams in my fog lamp sockets. They look like stock fogs but iluminate like good driving lights. Any degradation from the film or the clear film on my 7" headlights is less than even slightly dirty headlamps.

I did remove the headlamps and took them indoors where it was warm to apply the film.

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Ron Schroeder
'85 300 Turbo Diesel 2 tank WVO
'83 300 Turbo Diesel 2 tank WVO
Some former WVO vehicles since ~1980:
'83 Mercedes 240D
'80 Audi 4000D
'83 ISUZU Pup
'70 SAAB 99 with Kubota diesel
'76 Honda Civic with Kubota diesel
'86 Golf
Several diesel generators
All with 2 tank WVO conversion
LI NY