---
title: "Ceramic Coating High Spots: How to Spot and Fix Them Before and After Cure"
description: "High spots are un-levelled coating that cured as dark or rainbow patches. How to find them, wipe them early, and polish them out once the coating has hardened."
type: guide
service: ceramic-coating
publishAt: "2026-11-02T15:25:11.000Z"
canonical: "https://coateau.com/guides/ceramic-coating-high-spots"
sources:
  - label: "IGL Coatings: High spots in your ceramic coating"
    url: "https://blog.iglcoatings.com/high-spots-in-your-ceramic-coating/"
  - label: "Ceramic Pro 9H product page (flash and levelling times)"
    url: "https://ceramic-pro.com/us/catalog/ceramic-pro-9h/"
  - label: "Autogeek forum: How to remove a ceramic coating high spot, by Mike Phillips"
    url: "https://www.autogeekonline.net/forum/how-to-articles/118107-how-remove-ceramic-paint-coating-high-spot-mike-phillips.html"
---

# Ceramic Coating High Spots: How to Spot and Fix Them Before and After Cure

A ceramic coating high spot is excess coating that was not levelled before it started to cure, and it shows up as a darker patch, a smeary haze or a rainbow-colored streak on the paint. Caught within minutes, it wipes off. Caught within the first several hours, it can usually be softened with a drop of fresh coating and buffed level. Once the coating has fully hardened, the only fix is gentle polishing and recoating that area.

High spots are the most common cosmetic flaw in a new coating, and they are not a sign that the product is bad. They happen when the installer, or a DIY owner, leaves too much product on a section or misses it during the final buff. This guide covers why they form, how to find them, and what to do at each stage.

## Key facts

- **30 to 60 seconds** of flash time and a levelling window of about 60 seconds, per Ceramic Pro's 9H spec at 25°C and 50% humidity
- **Up to about 12 hours:** IGL suggests 1 to 2 drops of fresh coating on an applicator, then buffing once it activates
- **After a couple of days**, IGL says a high spot is much harder to remove and needs its cleaner or machine polishing
- **Rainbow or dark patches** under angled light are the giveaway, per IGL and detailing educator Mike Phillips
- **Polishing removes the coating** in that spot, so the area must be stripped and recoated afterward

## What causes high spots

Ceramic coatings are applied in small sections, allowed to flash for a short time, then levelled and buffed with microfiber. Ceramic Pro's 9H product page lists a flash time of 30 to 60 seconds and a levelling and wipe-off window of about 60 seconds at 25°C and 50 percent humidity. Miss that window, or leave a thick ridge of product, and the leftover coating starts to harden in place.

IGL describes high spots as un-levelled coating that has cured or is in the curing stage. It names poor buffing as the main cause, along with uneven application, where the applicator carries more product in some passes than others. Heat speeds things up. Direct sun or a hot panel shortens the flash time, which is why coatings go on in a shaded, temperature-controlled bay.

Panel edges, badges and the area near trim gaps are common trouble spots because product pools there and towels do not reach it easily.

- Too much product on the applicator
- Waiting too long before levelling
- Hot panels or direct sun shortening the flash time
- Poor lighting that hides streaks during the final wipe
- Using a damp or saturated towel for the final buff

## How to find them

IGL says high spots look like darker patches or rainbow-looking streaks, and that they are easier to see in good lighting or outdoors on a cloudy day. Direct sunlight can make a coating look level when it is not. On lighter colors, IGL recommends a flashlight to reveal them.

Mike Phillips, writing on Autogeek's forum, describes finding a high spot on a coated 1962 Impala with a handheld swirl-finder light and notes that overhead lighting works for horizontal panels but a handheld light is better for vertical ones. The best habit is to inspect each panel under angled light right after the final buff, while the fix is still easy.

## The fix depends on timing

The sooner you catch a high spot, the gentler the fix. The windows below come from IGL's guidance for its own coatings; other products cure at different speeds, so check the maker's instructions for the coating on your car.

If you are not sure how far the coating has cured, start with the gentlest method and step up only if it does nothing. The full cure timeline is covered at /guides/ceramic-coating-curing-time.

_High spot fixes by how long the coating has been on_

| When you find it | What IGL recommends | Effect on coating |
| --- | --- | --- |
| Right away | Wipe with a damp towel, then a dry towel, and buff off | None, coating stays intact |
| After several hours, up to 12 | 1 to 2 drops of coating on an applicator over the spot, then buff once it activates | Re-levels the area |
| After a couple of days or more | IGL Ecoclean Multi or machine polishing | Removes coating in that spot |
| Months later | Polisher with a medium or heavy polishing pad | Removes coating; recoat the area |

> Fresh coating softens a fresh high spot. A cured one has to be abraded off.

## Fixing a cured high spot

Once the coating is hard, wiping does nothing. Mike Phillips notes that a microfiber towel alone had no effect on the cured high spot he removed. He worked it off by hand with a soft foam finger pad and a one-step cleaner wax, then recommends chemically stripping the section a few inches beyond the worked area and reapplying the original coating per the maker's directions.

For a machine fix, use a dual action polisher, a soft finishing or polishing pad and a fine polish, and work only the affected area with light pressure. The goal is to remove the raised coating without taking off much clear coat. Phillips suggests using a body-shop-safe polish rather than a product with wax in it, because wax residue has to be stripped before you can recoat.

After polishing, wipe the area with a panel prep spray, apply a thin layer of the same coating, level it, buff it and inspect again under the same light. Keep a little of the original product for this reason. Phillips calls abrading and recoating the whole panel the most accurate fix, since a spot repair can leave a faint difference in gloss on dark paint.

## Preventing them in the first place

High spots are mostly a technique problem, and the habits that prevent them are simple. IGL recommends inspecting immediately after application, using a wider and softer application block, working one small section at a time, and buffing in multiple passes: the first to remove the peaks, the second to level, and an optional third.

If you are paying a shop, ask whether they inspect under swirl-finder lights before release and whether they will fix high spots found in the first few days. Most reputable installers do this as part of the job. DIY owners should start on a flat, easy panel like the roof or hood before moving to bumpers and badges.

- Work in shade on a cool panel, inside the maker's temperature range
- Use less product than you think and spread it thin
- Level with one towel and buff with a second clean, dry towel
- Check every panel under angled light before moving on
- Swap to fresh towels often; a loaded towel smears coating around

## Frequently asked questions

**Q: Will a high spot go away on its own?**
A: No. Once the coating cures, the extra product stays until it is polished off or the coating wears away, which can take a long time on a durable coating.

**Q: Can I just apply another layer over a high spot?**
A: Within the first several hours, a drop of fresh coating can re-level it, per IGL. Once the high spot has hardened, a new layer will not dissolve it, so it has to be polished off first.

**Q: Does polishing a high spot ruin the whole coating?**
A: No. Polishing removes coating only in the worked area. Recoat that spot with the same product and it will blend with the rest of the panel.

**Q: Are high spots a sign of a bad installer?**
A: One or two small ones are common and easy to fix. Many large, obvious patches across several panels suggest rushed work or poor lighting, and a good shop will correct them.

## Sources

- [IGL Coatings: High spots in your ceramic coating](https://blog.iglcoatings.com/high-spots-in-your-ceramic-coating/)
- [Ceramic Pro 9H product page (flash and levelling times)](https://ceramic-pro.com/us/catalog/ceramic-pro-9h/)
- [Autogeek forum: How to remove a ceramic coating high spot, by Mike Phillips](https://www.autogeekonline.net/forum/how-to-articles/118107-how-remove-ceramic-paint-coating-high-spot-mike-phillips.html)