Bondo is the generic term for plastic filler. When people refer to Bondo, they usually mean the type of filler used in automotive repair. It is also a brand name.  The term "Bondo" is a registered trademark in the United States and in many countries throughout the world. Bondo is known as a brand of two-part putty manufactured by 3M. Bondo is compounded from a resin base resembling putty and a thick liquid hardener. When these two substances are kept separate, they remain supple. When mixed together, the compound becomes hard. Upon application, Bondo dries to a hard finish. Bondo quality has changed considerably since 1955. Plastic fillers that are on the market today are as durable as lead. 
Bondo was invented in Miami, Florida by Robert Merton Spink in 1955. He was a Navy World War II Veteran who passed away on September 28, 2010. He was referred to as Bondo Bob.  The first batch of Bondo was made by mixing talc and polyester resin in an old dough machine. Later that year, the Bondo body-filler was born. Though originally used mainly for automobile body repair, Bondo is also widely used by carpenters for repairing wood defects not exposed to weather.
Body fillers were developed as a replacement for body solder, or molten lead, that was formerly used for the same task. Body solder is much more durable, but may require more effort to apply. Lead-based solder poses toxic hazards for people and the environment due to the heavy metal components. Although Bondo body fillers and other polyester body fillers are far safer to work with than their lead-based counterparts, they can still pose significant health risks. The fumes are toxic.
Home and hobby
3M distributes Bondo "All Purpose Putty" which may be used on wood, asphalt, masonry, metal, drywall and tile.
Bondo brand fiberglass fillers are used in the marine industry. A glass-reinforced filler, resin, resin repair kit and long-strand glass hair are the types of fillers manufactured.
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