Meet Maybelline’s Build-A-Brow 2-in-1 brow pen + sealing gel -- builds waterproof natural-looking, full brows lasting up to 24 hours. Brows look so real you can’t tell its makeup! Sculpts and seals your brow to perfection. Say goodbye to sparse, thin and uneven looking brows forever. Build a fuller brow in 2 easy steps with Build-A-Brow 2-in-1 brow pen plus sealing gel. Its ultra precision pen creates hair like strokes and its clear sealing gel locks naturally fuller and fluffy brows in place with a non crunchy finish. Sweat resistant, smudge resistant and humidity proof.