Author: Nodar, Car Select expert · May 6, 2026 · 5 min read
Paint-thickness gauges: what the device shows and how to read the results
In short
On most mass-market brands factory paint measures 100–160 µm, and a 20–30 µm spread between panels is normal. Readings of 200–250 µm and above almost always mean filler and a respray. That is not necessarily a serious crash, but it belongs in the price.
A paint gauge is the fastest way to find out whether a car has been in an accident, even on a perfectly polished body. Its readings can't be argued with, but you need to know how to interpret them.
The gauge measures the thickness of the non-magnetic layer over the metal body: primer, paint and clear coat together. From the factory, this layer goes on evenly and stays within a narrow range across every panel on the same car. As soon as filler and a fresh coat of paint go on a panel, that thickness jumps.
What counts as normal
For most mass-market makes, factory paint sits around 100–160 microns. A 20–30 micron spread between panels is normal. That's just how a factory line works. A sharp spike on one panel while its neighbors read flat is what deserves a closer look.
When the number points to bodywork
Readings of 200–250 microns or higher almost always mean filler and a respray. That doesn't automatically mean a serious accident: a parking-lot scrape gets painted locally too. But a buyer should know about it and factor it into the price: factory paint and paint rebuilt after an impact aren't worth the same.
Where repair marks tend to hide
- Front fenders and bumpers: the most common spots for minor collisions
- Doors: a typical target for parking-lot scrapes and spot repairs
- Pillars and rocker panels: the gauge catches what tint or trim pieces are hiding
- Hood and roof: rarely painted without a reason, so a deviation here signals something more serious
One pass with the gauge isn't enough for a verdict: every panel needs measuring, not a sample, and the numbers need to line up with the body's geometry and any welding marks. Read that way, the gauge readings become grounds for negotiating the price.
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