Diamondite Liquid Armor vs Megs Headlight Protectant

Jaretr1

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This is not a thorough review, but just some thoughts and observations on the two products. The car in question is a 2006 Acura RSX which has a large amount of relatively horizontal plastic surface to the headlights.

A couple years ago after I got into this, and my car had been in an accident (and both headlights replaced) I know I wanted something to protect them since they were new. There weren't many clear headlight protectants (at least that I knew about) but Diamondite Liquid Armor seemed to make a promise of results that I was looking for. After 2 years of using it, I can say it didnt work.

When I first began applying it to my headlights, they needed no restoration as they were new. However, over time, they have begun to deteriorate, oxidize, show micro cracking etc. This is with regular use of Liquid Armor. Perhaps Liquid Armor slowed this process down, but it certainly didnt stop it. Many times I actually did a minor restore of the headlights, and reapplied liquid armor, but ultimately, the haziness returned. I can say I am extremely dissatisfied with the results of this product.

After application of Liquid Armor, the headlights had no noticable difference in feel, and they never shedded or beaded water. They just were.

On a whim at the auto parts store, I picked up a bottle of new Meguiars Headlight Protectant a few weeks ago.

Before applying, I actually did a pretty good job of restoring the headlights. Using Megs PlastX, and a white CCS pad, I got out my PC 7424XP and went to work on the headlights. I got a 90% "correction" / restoration on them.

The Megs headlight protectant is a cream, where the Liquid Armor is a spray liquid. I applied the headlight Protectant and instantly the headlights felt different. They had more of a slick feel, the same kind of feel after applying a wax or sealant. They also beaded water somewhat, where before they didnt at all. In essence, at least to my pea brain, they seemed to have some sort of coating or protection that Liquid Armor never seemed to leave.

Now its just a waiting game to see if this product actually does more to protect the headlights then liquid armor did.

Sorry no pics, but not sure I really had anything to actually show.

I have been getting away from Mequiars products because I have found that there are as good if not better products from the smaller boutique brands, but perhaps this is a case where the Megs product is actually superior? Time will tell, but the initial impressions are better.
 
I wonder if it's a chemical reaction between the factory coating and what you're applying? I did learn long ago that partially restoring a headlight by removing only the damaged portion and re-coating that same area doesn't always work. It may be that some solutions will react with the factory coating causing problems. The pro coatings are designed to adhere to bare polycarbonate and any minute residual of polishing compounds or water will cause problems. This is why we stress scrubbing the headlight with alcohol twice before applying the new coating.

Microscopically, polycarbonate is very porous and rough. Factory coatings fill in this roughness.
Just a thought.
ray6
 
I am not familiar with products sold as headlight protection coatings that you simply wipe on.

The key to keeping headlights from clouding up again is to protect them from moisture and UV. Moisture protection is pretty easy, not so for UV.

As a general rule, the thicker the coating, the longer the UV protection, so I'm suspicious of thin, wipe-on coatings.

A good UV protective coating like the one applied at the factory is 2-4 mils in thickness.

There are coatings available that will apply a 1-3 mil coating with UV protection. The key to headlight protection is that you need to remove the old coating, then replace it with a strong, thick UV/sealer. Otherwise, your results will not last long.

If you're restoring for money, you want to be able to tell your customer it will last 2 years. You need a final coating that will last without maintenance and withstand car washes.
ray6
 
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