Bondo is a brand of body filler, but it's also the generic term for plastic filler that, when uttered, makes many car guys cringe. Anyone restoring an old car knows what it's like to start working ...

The filler they used is 3M Automix 5895, a two-part flexible epoxy adhesive designed to repair TPO plastics. TPO stands for Thermo Plastic Olefin and is what many bumpers are made of.

Several areas had to be built up with filler and glued in bits of plastic as a base. ... This led Robert ‘Bondo Bob’ Spink to invent a much less toxic auto body filler that we now know as Bondo.