Lancome Oscillation Powerbooster lash primer ($39; lancome-usa.com
). THE PROMISE
To strengthen and lengthen lashes and help keep mascara on all day without flaking. THE EXPERT SAYS
"The vibration simulates the way we makeup artists wiggle the brush to thicken lashes," says makeup artist Anthea King. WE SAY
It made our lashes huge, and it didn't flake. But it needs to be applied with careif you really load it on, it can get clumpy when you put mascara over it.