Find MAC COSMETICS Studio Fix Every-where Concealer Pen on Editorialist. ↵ ↵ ↵ What it is: A multi-use concealer pen with medium-to-full buildable coverage and a natural matte finish that is transfer-proof, waterproof and wears for 36 hours. What it does: Click, tap, go! Conceal and correct with the multi-use concealer pen that doesn't cake or crease. The lightweight, hydrating formula provides medium-to-full buildable concealer coverage with a natural matte finish that lasts for 36 hours…