Headlight Restoration
They didn't seem too yellow, but when you spray the cleaner in the kit, it looks like the yellowing melts right off. You can see the after pic, you can see the silver reflector again! The lights at night are much better now.

i buffed polished mine a couple times with compound but interested in the UV block chemical ap.
I will have to restore the ones on my 'T-bird, they cannot be replaced with new.
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If the headlight is not too far gone, they can be restored and maintained to a like new condition. I can take a picture of my Taurus, almost two years after I first polished them. The restoration literally made them look new, and two years later, they still look new. I did the same on my Ford Focus, and so far they are not fading at all, I did them last summer.
The main benefits of polycarbonate headlights versus glass.
Extreme impact can shatter a glass lamp, glass on the highways can be a hazard to people and other vehicles.
Glass is difficult and expensive to form into aerodynamic shapes, and the CAFE standards required that vehicles become more aerodynamic.
A polycarbonate housing can more easily be formed into a housing that can have a removable replaceable bulb
Automakers don't have to design their cars around the available headlight designs, they can instead design housings that help give the car its shape.
Glass has its obvious benefits too the main ones being that it is impervious to most chemicals and is unaffected by sunlight. But the expense and drawbacks apparently exceeded the benefits, so glass housings are only used on expensive cars. Most of these expensive cars are designed in such a way that they don't need aerodynamic headlights, or they are vehicles subject to luxury tax anyway. Another drawback is that the whole headlight has to be replaced when it burns out.
On the Aerostar, having plastic headlights is to a large extent a moot point, the vehicle is not aerodynamic. But I have looked into converting to the older glass housings before, there are really no benefits to doing so.
One of the first problems I encountered with the headlights on my 87 Mustang was that they leaked. On closer examination, the leaks were from the joint between the front lens and reflector housing. Using a sharp knife, I was able to separate the lens from the housing. I cleaned off everything and used RTV to glue the lens back onto the housing. That worked for a few months until the plastic released itself from the RTV. I tried gluing the lens a couple more times with various other goop, and it never held. So I actually had a hard time keeping the lens sealed to the housing. Maybe they're sealed better today.
So glass housings will not leak like that. They will be heavier and more expensive, but it's going to keep shining for a lot longer than the plastic housing. And I've seen many glass headlights with pretty complicated shapes, like on Porsche's and Benz's. I've also seen plenty of them on chap cars, like an old Hyundai Excel. Heck, even the 60's vintage VWs had glass bubble in front of their head lights.






