A lesson for anyone as stupid as me, think about safety first. I was MIG welding inside my car and had forgotten I also had a bottle of Acetone inside that I had used to clean the metal. Up until that point I always checked to make sure I had not left it in the car before welding but this time I didn't. A spark ignited the bottle even though it had the cap on and went up in flames, a few seconds of panicking (felt longer) then found the fire extinguisher and all was OK, no harm done but major lesson learned.