Black Magic Sealer Coating is used to prolong the life of the Eyelash Extensions after Application. It coats the lashes and provides a waterproof barrier. It gives the lashes a fantastic glossy finish. It can also help to conceal adhesive fumes after the eyelashes have been applied. Apply Black Magic Coating by squeezing a small amount onto a disposable Mascara Wand and brush on as if using mascara.