How to detect body filler

[GNRick]

Anybody try one of these? The Filler Detective OFFICIAL WEBSITE - Finds Body Filler and WILL find: Bondo ® 3M™ Bondo Filler® + 3M™ A Acryl–Green Spot Putty + Feather-Rite ® USChemical® + Duraglas®USChemical® + Evercoat®Quantum1® + U-Pol Flyweight Gold

 

[Pronto]

A simple magnet works for me.

 

[RIFF RAFF]

Ive had good luck with a magnet .. If it dont stick .. Houston we have a problem