The Contender: Liquid Lash Extensions
Physicians Formula Eye Booster Instant Lash Extensions Kit, $15; ulta.com
Time Claim: 24 Hours
How It Works: Two formulas (a thickening mascara and one with invisible fibers) create a false-lash effect. The polymer-rich mascara forms a glossy, crunch-free film onto which fibers adhere. A second coat of mascara seals the deal.
Our Tests Revealed: After applying it in the a.m., one tester saw a few errant flakes before bedtime, but lashes still looked lush the next morning. Another thought the system left lashes nice and full "but not as long as I typically like."