Lasts: 12 hours
8:00 A.M. The gel glides on easily and the line looks smooth.
12:30 P.M. Run on the treadmill for 40 minutes. Quick shower, then head back to work. The line has smudged a bit; color has faded into a pretty, dark gray.
8:00 P.M. Two face washings required to get all the liner off.
—Jessica Silvester, assistant editor