Here are some of the bondo tools utilized including a pneumatic gun and cartridges by 3M. The body shop up in Seattle completed about half the bondo and it was up to me to do the remainder. And the engine bay used a lot of bondo. The 3M gun became my new best friend for this effort. The electric sander pictured in the bottom left is used to flatten the bondo during its green state, intentionally clogging the sand paper. The air file (belt sander) gets into tight places.