Why Detecting Filler Matters
Whether you’re:
- Buying a used car
- Inspecting trade-ins
- Working in collision repair
Body filler (Bondo) can dramatically change panel thickness.
A paint thickness gauge makes hidden repairs visible.
What Is Normal Factory Paint Thickness?
Most OEM finishes measure:
- 3–7 mils (75–180 microns)
While this varies by manufacturer, dramatic spikes signal repair.
Step-by-Step: Detecting Filler
Step 1: Calibrate Your Gauge
Use calibration foils and bare metal plate before measuring.
Step 2: Measure Multiple Points Per Panel
Take readings:
- Top
- Middle
- Bottom
- Near edges
Step 3: Compare Readings Across Panels
If one panel reads:
-
5 mils (factory range)
And another reads: - 18–25+ mils
That’s a red flag.
What High Readings Mean
8–12 mils → Likely repaint
15–30+ mils → Heavy filler likely present
Consistency is key. Filler usually creates uneven readings.
Recommended Gauges for Filler Detection
Models like the:
- Elcometer 311
- Elcometer 456
offer reliable ferrous and non-ferrous detection, ideal for:
- Body shops
- Auto auctions
- Dealerships
- Vehicle flippers
Why Professionals Trust ClearCoat PRO
As an authorized Elcometer retailer, ClearCoat PRO ensures:
- Genuine products
- Warranty-backed tools
- Professional-grade accuracy
👉 View available inspection tools here: https://www.clearcoatpro.us/collections/elcometer-series