[MarinerZ4C]

Thought I would add an option for others to consider.

My 2006 3.0Si Coupe came to me with one headlamp looking nearly new and the other side 'restored' by someone who did a really good job on about 9/10 of the headlight. I looked on the store shelves for a curing UV-absorbing top coat, and I came up empty at several chains. So I bought this: SYLVANIA Headlight Restoration Kit (about $20 plus tax & shipping from Amazon)

This kit is designed for two headlights, and I'd say it is sized just right for that. It takes a little finesse and elbow grease to do a really good job, but it's got good components, and it gives a very satisfying result. Unlike several other kits, the clear coat with UV-Absorbers actually is a curable hard-coat.

It takes a little skill and patience to do it right, but if you do other sanding/painting/varnishing DIY's, you will have no problem. Do read the directions fully, since they matter. This product was highly rated by Project Farm, and he was correct !

I cannot yet rate longevity. But this has a better shot than anything else i have seen, except prepping the same way and spraying the lights with a 2K Clear Coat.

I may or may not apply a PPF (paint protection film) on the lenses eventually. PPF can sometimes give an iridescent Moire optical effect, which it did on my 2005 325xi when installed on brand new lenses.