Quote:
Originally Posted by ryansbmw
After sanding and polishing, you need to either spray clear coat, apply PPF or ceramic coat them. If you spray clear coat, it will probably be multiple coats with some light sanding in between. Those 3 options will prevent the headlights from yellowing or clouding up again due to UV rays.
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This is the important part, and the part which most people (including you) get wrong. Spraying clear coat on a polished surface will never last because the clear needs something to adhere to (usually sanding scratches). Having done vehicle paint repair since the late 80's and I can count on one hand how many people I've seen be truly successful at refinishing headlights on their own with lasting (5+ years) results.
I always recommend replacing the housing with a used, low-mile OEM unit when you're talking about a $40K+ car. Now if you're driving a $10K Kia...