What grit to restore headlights?

[NovaLee]

For headlight restoration, use a wet sanding grit progression from 400 to 3000. Start with coarse 400-800 grit to strip oxidation, transition to medium 1000-1500 grit for smoothing, and finish with fine 2000-3000 grit for polishing before applying a protective sealant. The exact starting point depends on damage severity.

Industry practice and detailer benchmarks confirm this graded approach is essential. Jumping to fine grit on heavily yellowed lenses is ineffective, while starting too coarse on minor haze creates unnecessary work. Your sandpaper sequence should match the damage level:

Damage Level	Recommended Grit Progression
Severe Yellowing/Heavy Oxidation	400 → 600 → 800 → 1500 → 2000 → 3000
Moderate Haze/Scratches	800 → 1500 → 2000 → 3000
Light Haze/Fine Scratches	1000 → 1500 → 2000 → 3000

Always perform wet sanding. Use water with a drop of dish soap as lubricant. This prevents clogging the sandpaper, reduces friction heat, and washes away debris for a clearer view of your progress. Dry sanding will generate deep scratches that are difficult to remove.

Change sanding direction with each grit change. If you sand horizontally with 400-grit, switch to vertical motions with 600-grit. This technique makes it easy to see when you’ve fully removed the scratches from the previous, coarser stage.

The final polishing grits, 2000 and 3000, prepare the surface for protection. Sanding completely removes the factory UV-blocking coating. Without applying a new UV-resistant clear coat, sealant, or ceramic coating, oxidation will return rapidly, often within a few months. This final step is non-negotiable for lasting results.

For plastic headlights, sanding beyond 3000 grit is generally unnecessary, as polishing compounds work effectively on this finish. While some professionals may use 320 grit for extreme cases, it risks removing excessive material and is not recommended for DIY beginners.

[Eliana]

As a weekend DIYer, I learned the hard way that grit order matters. I tried to fix my cloudy lights starting with 1500 grit – wasted an hour with no improvement. My mechanic buddy set me straight: “You’re just polishing the cloudiness.” He handed me 600-grit paper and said to start there. The difference was immediate. The key is to match the grit to the damage. If your lights look yellow and crusty, don’t be afraid to start coarse, around 400 or 600. Then work your way up through the numbers like the table shows. Just take your time, keep it wet, and don’t skip the protective spray at the end. It’s satisfying work.

[Donald]

In my detailing shop, we follow a strict protocol. We assess the lens under a light first. Severe cases require aggressive cutting: 400-grit to remove the bulk of the dead coating, then stepping through 600, 800, and so on. The goal at each stage is to create a uniform scratch pattern, then replace it with a finer one. The most common mistake I see is incomplete scratch removal. If you move to 1500-grit before all the 800-grit scratches are gone, those deep marks will still be visible after polishing. Our rule is to sand in cross-hatch patterns and inspect from multiple angles under bright light before moving to the next finer grit. The final surface after 3000-grit should feel like smooth, frosted glass.

[BradleyFitz]

I’ve handled hundreds of headlight restoration claims. The single factor that determines longevity is the post-sanding protection. We see many vehicles where the lights were sanded but not sealed. They look great for three months, then the haze comes back worse. Applying a UV-blocking clear coat is as critical as the sanding itself. It’s the barrier. Without it, you’ve just accelerated the next oxidation cycle. From an insurance adjuster’s view, a proper restoration includes that final sealant step. It turns a temporary fix into a multi-year solution, which affects vehicle value and safety.

[StWalter]

Working at an auto parts store, I guide customers through this daily. They often buy only 2000-grit, thinking a fine paper will do it. I ask them to describe the damage. If they say “yellow” or “can’t see scratches through the haze,” I recommend a kit or a range of papers from 800 up. The progression is non-negotiable—you need the coarser grits as cutting tools and the finer ones as finishers. We advise using a spray bottle with soapy water and changing the water frequently to keep it clean. The most frequent question is about power tools. You can use a drill with a backing pad, but hand-sanding gives you more control to avoid burning the plastic, especially on edges. Always finish by hand with the finest grit for an even surface.