I'm only speaking from personal experience from what I have used and seen.
We had a fire in a 3 car garage, one of the guys was welding up a new cross member.
I saw it and was heading that way with a bucket of water but one of the guys beat me with a 25lb extinguisher. When he lit it off the whole shop turned white quick, it was rather funny.
It did put the fire out quick but my lungs were burning for a couple days after that and I wanst in there more than 45-60 seconds.
We spent weeks finding that stuff everywhere
Even had to pay to detail a customers car that was on the other side of the shop.