Bondo is a polyester putty product originally marketed as an automotive body filler. Nowadays the brand name is used by 3M for a line of American-made products for automotive, marine and household repairs. The term Bondo is trademarked by 3M, but is commonly used to refer to any brand of automotive repair putty due to its popularity. It is also used by sculptors.
History
Before the 1950s, body solder was often used to repair large imperfections prior to painting in both new cars and vehicle repair shops. It was developed by WWII veteran and automotive repair shop owner Robert Merton Spink of Miami, Florida. Bondo was acquired by 3M in 2007.