Waterproof lip liner is intended to fill in uneven areas on the outer edges of the lips before applying lipstick to give a smoother shape. Lip liner not only helps to designate the area in which you'll be applying lipstick, but it also helps to ensure your lipstick doesn't bleed and has a longer-wear finish no matter if it's a creamy formula, matte finish, classic tube, or liquid lipstick.

Waterproof lip liner will work as a primer for your lips, and act as a tacky base that will make your lipstick stay on longer. Lip liners work especially well with glossy colours as they control the bleeding of the colour. It makes your pout look fuller, enhance the longevity of your liquid lipstick, and stop colour from wandering outside the lines.