I've finally let one of my photographer friends, Miah Oren, shoot while I painted a gradient 12-feet-tall in a dark stairwell. She braved my Justin Bieber and Destiny's Child jams, too.
I had to work very quick, and used a couple liters of water on the wall. This painting process took around 30 minutes -- and about an hour to contain and cleanup the water world down below.
Thankfully, not photographed is me standing on the second to top step of a 6' ladder in stretchy painting workout pants.