practical method to detect car repairs using a magnet pen, which doesn't stick to areas with non-magnetic fillers , commonly used to mask crash damage on used cars.

Nice trick!

Just make sure you aren't checking your plastic bumpers or fenders.

Smart tip — always keep a magnet pen on hand when checking out a used car. It can save you from costly surprises later.👌

Smart and simple, magnet pens are such a clever hack for spotting hidden repairs.

Danm many things on internet

Simple and practical detection tool

The magnet pen is a clever invention! It reveals the secrets lurking beneath the surface of those shiny used cars.

Would have great in the 80s

It's easier to knock on it with your knuckle. There is a distinct different in sound between a panel with no work, and one with mud on it.

Impressive method for spotting hidden damage