Buyer guide
Paint thickness readings: how an inspector finds a repainted panel
By the InspektAI inspection team, 2 October 2026, 3 min read
A good repaint is invisible in a photo and very hard to see in a showroom. The colour matches, the finish is glossy, and the seller says it was a scratch. The one thing a respray cannot hide is thickness: every coat of filler, primer and paint adds to the film on the metal. A paint-thickness gauge reads that film in microns (µm), panel by panel, and a repaired panel stands out against the ones around it.
What normal looks like
Factory paint on the steel panels of a modern car is usually somewhere around 80 to 180 µm. The exact figure depends on the manufacturer and the paint: newer water-based finishes go on thinner than older solvent paints, and roofs and tailgates often read lower than the doors and fenders beside them.
That is why an experienced inspector does not judge a panel by its absolute number. The question is always how a panel compares with its neighbours on the same car.
What a repaint looks like
A repainted panel carries the factory film plus everything the body shop added, so it typically reads well above the untouched panels around it. One raised panel next to a dent is a local repair. A whole side of the car reading high is a much bigger story.
What the gauge cannot read
Most gauges read paint on steel. Plastic bumpers and some trim do not give a meaningful reading, which is why our reports list bumpers and sills as not measured rather than inventing a number. Pillar readings taken through trim or transit tape are listed separately and not compared with the body panels. For those areas the inspector relies on what the eye and the hand can find: overspray on rubber seals, masking lines, orange-peel texture that differs from the next panel, and tool marks on the bolts that hold a panel on.
What to do with a repaint finding
A repaint is not automatically a reason to walk away. A properly repaired scratch on one panel, priced honestly, can be a fair deal. What matters is why it was done and how much of the car it covers.
- Ask the seller for the body-shop invoices. A genuine repair usually has paperwork.
- Check the service record for body or accident work, and compare its extent with what the gauge found.
- Look for structural signs: replaced welds, uneven seam sealer, bolts that have been turned.
- Price it as a resale cost as well as a repair cost: the next buyer’s inspector will find it too.
Frequently asked questions
What is a normal paint thickness on a car?
Factory paint on steel panels is usually around 80 to 180 µm, varying by manufacturer and paint type. Compare each panel with its neighbours rather than with a fixed number.
Can a paint gauge tell if a car has been in an accident?
It shows which panels were refinished, which is often where accident repairs are. Combine it with the service record and a structural check to know whether the damage was cosmetic or deeper.
Does a matching colour mean the paint is original?
No. A good body shop matches colour closely. In one Jeep Compass we inspected, all seven repainted panels matched to the eye; only thickness gave them away.
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