Get primed and ready for action with Urban Decay's 24/7 Glide-On Lip Liner Pencil. This long lasting, waterproof lip liner glides on smoothly to prime And define-for long lasting high pigment lip color and precise lines. When you use 24/7 Lip Liner Pencil to fill in your lips completely, it primes them for lipstick or gloss, grabbing on to color to help it last. No matter what you do, this formula stays put through everything (yes, everything).