Funny thing is that video is so RAW, it's actually something I would NOT put up again, but, since its gone and going viral, might as well keep it up! I did that back in 2008, my poor wife took that video, she had a face shield on, and held the camera under it for 3 minutes, I said just take it of me doing some work. The 'problem' with this video is the PSI is around 90 (the valve was broken then...and I didn't know it) There's a couple examples of I 'fell into my work' bringing the nozzle too close. But, you're right doing a whole qtr panel in 3 minutes is FAST. There's variables you have to consider; the underlying surface -- what its made of, the length of time you want to use plastic media that costs $1.15 a lb, etc.