How I Restored the Oxidized Headlights on My 2007 Avalanche

An oxidized headlight lens can be structurally sound and still look finished. The damage is on the outside surface, which means it can often be sanded back and re-protected instead of replaced.

I wet-sanded the OEM lenses on my 2007 Chevy Avalanche through five abrasive stages and finished them with Meguiar’s Keep Clear Headlight Coating G17804. This article records what I actually did, corrects a grit I misspoke on camera, and adds the application, cure and hazard guidance from Meguiar’s technical bulletin and current safety data sheet.

The truck is a 2007 Chevy Avalanche, but nothing here is Avalanche-specific — the same method applies across the GMT900 generation, and to most oxidized polycarbonate lenses.

What this restoration does — and does not prove

The lenses were heavily oxidized — cloudy on the outside, with the reflector bowls showing through the haze. This is an on-vehicle exterior correction using staged wet sanding and an aerosol coating.

I did notice better light output once the lenses cleaned up, and that is worth saying plainly. But it is an owner’s impression, not a measurement — I ran no controlled light-output or beam-pattern test, so this article does not put a number on it. It also does not establish a coating lifespan, because there is no exposure history yet.

Exterior sanding will not repair:

• cracks in the lens
• broken mounting tabs
• failed housing seals
• condensation or haze inside the assembly
• a burned or damaged reflector
• electrical, bulb or aiming faults

Confirm which side of the lens the defect is on before you buy any sandpaper. Internal haze is a sealing problem, not a surface problem, and no amount of exterior work will reach it.

Parts, materials and PPE

Item	Purpose	Source	Notes
400-grit wet/dry paper	Heavy correction	Used in the video	Used because these lenses had heavy oxidation. Not a universal starting grit.
1000-grit wet/dry paper	Second correction stage	Used; corrected at 2:44	This is the actual second grit, not 800.
2000-grit wet/dry paper	Refine 1000-grit marks	Used in the video	I mention skipping it on camera, but the job I filmed includes it.
2500-grit wet/dry paper	Further refinement	Used in the video	Keep masking and nearby paint under constant inspection at this stage.
3000-grit handheld abrasive pad	Final sanding stage	Used in the video	Left over from a Cerakote kit. I ran three passes with it.
Spray bottle	Keep the work wet	Used in the video	I used Pine-Sol and water as the sanding lubricant. Plain water also works.
Masking tape and rags	Protect paint and bumper	Used in the video	Stop immediately if wet tape lifts. I used rags along the lower edge where wet tape would not hold.
Glass cleaner	Remove residue before coating	Used in the video	I cleaned the lenses and housings three times before coating. The lens must be clean, cool, dry and residue-free.
Meguiar’s Keep Clear Headlight Coating G17804	Protective coating	Product page, TDS and SDS	Two medium wet coats with 50% overlap.
Protective gloves	Skin protection	Current G17804 SDS	Select gloves suitable for the exposure.
Eye protection	Eye protection	Current G17804 SDS	Section 8 identifies indirect-vented goggles.
Outdoor / well-ventilated area	Vapor control	Current G17804 SDS	Respiratory protection is required when ventilation is inadequate.

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Before sanding: inspect the housing and choose a starting grit

Confirm the defect is on the outside of the lens. Interior condensation, internal haze, damaged reflectors and structural failures require diagnosis or replacement — exterior sanding cannot reach them.

The 400-grit paper used here was an aggressive choice for heavy oxidation. Do not convert that project-specific decision into a universal instruction. Start only as coarse as the actual defect requires. Coarse abrasives remove material quickly and leave scratches that every later stage then has to remove — starting too coarse creates work, not results.

Mask substantially beyond the lens. Protect the bumper and any adjoining painted or trimmed surface. Water weakens tape adhesion, so inspect the masking continuously. If tape lifts, stop before the abrasive reaches exposed paint.

The exact wet-sanding sequence I used

This is the sequence exactly as I ran it on the truck.

400 grit: heavy correction

Fold the paper into quarters and use the flat of your palm across the broad sections, keeping the surface wet. Plan on a minimum of three passes at this stage. If the lens is badly gone, it will take more. The objective is to remove the heavy exterior oxidation and establish an even surface before any finer grit touches it.

Use controlled pressure and avoid rolling an abrasive edge into paint or trim. Clean the abrasive repeatedly — trapped debris cuts scratches deeper than the grit you are working with, and those scratches have to come out later.

1000 grit: the spoken correction

I say “800” at 2:12 and again at 2:34 before correcting myself at 2:44. The abrasive I actually used for the second stage was 1000 grit.

Repeat the wet process with even support. Corners need more controlled finger pressure than the broad flat section. The purpose of this stage is to replace the coarse 400-grit pattern with a finer, uniform one.

2000 and 2500 grit: refine the scratches

The job I filmed uses both stages. I mention on camera that 2000 might be skipped, but I did not test that shortcut, so I am not presenting it as verified.

At each stage, rinse or wipe away the slurry, inspect the surface, and confirm the previous grit’s deeper scratches are gone before moving finer. Moving on early means every remaining scratch is still there under the coating.

3000 grit: the lens may still look dull

I used a small handheld 3000-grit pad, three passes.

A uniformly dull or frosted surface at this stage is expected and is not the finished appearance. The coating supplies the final gloss. Two cautions when judging this stage: a wet lens always looks better than it is, and a colour-graded photo always looks better than the lens. Assess it dry, in daylight.

Clean, dry and re-mask before coating

After the last sanding stage I removed the tape, washed the lens, and cleaned the headlights and housings three times with glass cleaner.

Meguiar’s technical bulletin requires a clean, cool, dry headlight in the shade. Mask around the headlight, avoid breezy application conditions, and remove overspray immediately. Dry the lens completely before coating.

Apply Meguiar’s G17804 coating

In the video I used two passes and a medium coat with 50% overlap. The instructions state a 3–5 minute dry time and a 24-hour cure. Meguiar’s technical bulletin gives the full sequence:

1. Shake the product well.
2. Apply one medium wet coat over the entire lens.
3. Overlap the previous pass by 50%.
4. Allow the first coat to dry for 3–5 minutes.
5. Apply the second coat to seal the lens.
6. Allow 3–5 minutes to dry to the touch.
7. Allow 24 hours for full cure.

Do not invent a repair procedure for a run, sag or dry-spray defect. Stop adding uncontrolled coats and consult the current label or Meguiar’s support.

Aerosol safety the video should have stated

The current G17804 SDS assigns the signal word Danger and identifies the product as an extremely flammable aerosol. It also warns that the pressurized container may burst if heated.

• Keep away from heat, hot surfaces, sparks, open flames, smoking and all other ignition sources.
• Do not spray on an open flame or other ignition source.
• Do not breathe vapor or spray.
• Use only outdoors or in a well-ventilated area.
• Wear protective gloves and eye protection.
• Use suitable respiratory protection when ventilation is inadequate.
• Protect the can from sunlight and excessive heat.
• Read the complete current label and SDS before use.

There is a real trade-off worth naming. I pulled the truck partly under cover to get out of the wind before spraying. Sheltering from wind also reduces ventilation, and the SDS is unambiguous about which of those matters more. Get out of the breeze, but do not spray this product in an enclosed space.

These are manufacturer safety requirements. They are not a claim that PPE or ventilation were discussed anywhere in the video — they were not.

Troubleshooting

Symptom	Likely issue	Response
Deep scratches remain after finer stages	Coarse scratches were never fully removed, or debris contaminated the abrasive	Stop, clean the surface, return only to the grit needed to remove the defect, then repeat every subsequent stage in order.
Mixed clear and frosted patches before coating	Sanding pattern is uneven or residue remains	Keep inspecting and cleaning until the surface is uniform. Do not coat over an uneven pattern.
Tape lifts while sanding	Water weakened the adhesion	Stop immediately, dry the edge, re-mask before continuing.
Lens looks dull and frosted after 3000 grit	Expected at this stage	Not a fault. Continue to cleaning and coating.
Coating appears dry or gritty	Spray too light, too distant, or wind-affected	Stop adding uncontrolled coats. Follow the current label or contact the manufacturer.
Coating runs or sags	Coat too heavy or applied too close	Do not apply a guessed fix. Consult the label or manufacturer support.
Haze is inside the housing	Exterior sanding cannot reach the defect	Diagnose the seal and moisture source; repair or replace the assembly.
Lens cracked, tabs broken, reflector damaged	Structural or internal failure	Replace or correctly repair the assembly. Restoration is cosmetic exterior correction only.

Mistakes and limitations from this job

Stated plainly, because the useful part of a real job is where it went sideways:

• I named the second grit wrong on camera — 800 instead of 1000 — twice before correcting it.
• Wet masking tape lifted and needed attention near the paint. I used rags where the tape would not hold.
• My spoken recoat wait is inconsistent on camera. Meguiar’s 3–5 minute interval is the one to follow.
• I gave no PPE or ventilation guidance on camera for a flammable aerosol. That is a fair criticism of the video.
• I ran no controlled light-output, beam-pattern, nighttime-visibility, cost or durability comparison.

Result and follow-up

My conclusion is modest and I am keeping it that way: it is “definitely better than what it was”, and I was happy with it. It is a beater truck and this was a cheap fix, not a restoration to as-new condition.

I am hoping for two to three years out of the coating. That is a hope, not a spec — Meguiar’s publishes no lifespan figure and I have no exposure history yet. I will add a dated update here with comparable ungraded photos once there is something real to report.

Related FullSizeChevy resources

• GMT900 hub
• Best Headlight Upgrades for GMT900
• LED & HID Lighting Upgrades for GM Trucks
• Companion G17804 coating video
• Continue the discussion: DIY Headlight Restoration on My 2007 Avalanche on the FSC forum

Frequently asked questions

Why does the lens still look cloudy after 3000 grit?

That is expected. The sanding stages leave a uniform dull or frosted surface, and the coating supplies the final gloss. Uneven patches or remaining deep scratches are a different problem and must be corrected before coating.

How long should G17804 dry between coats?

Meguiar’s technical bulletin specifies 3–5 minutes between the first and second coats.

How long does G17804 take to cure?

The bulletin states 3–5 minutes to dry to the touch and 24 hours for full cure.

Should every oxidized headlight start at 400 grit?

No. I used 400 because these lenses had heavy oxidation. Choose a starting grit based on the actual defect and avoid removing more material than you have to.

Can exterior sanding repair internal condensation or cracks?

No. Those are internal, sealing or structural defects, and exterior work cannot reach them.

Does restoring the lens improve how well the headlight lights the road?

I noticed better output once the lenses were clear, and that is worth saying. But I ran no controlled light-output or beam-pattern test, so treat it as an owner’s impression rather than a measured gain. If your lenses are hazy on the inside, or the aiming is off, restoration will not fix either.

Authoritative sources

• Meguiar’s G17804 product page
• Meguiar’s G2000/G17804 technical bulletin
• Meguiar’s/3M G17804 safety data sheet, version 3.03, issued 2025-09-23

Find every repair, buying, maintenance, and troubleshooting guide in the GMT900 Owner’s Hub.