This lash primer is the first step of the perfect trio for optimal retention of your lash extensions!! After initially cleansing the lashes, the primer works to remove any left over oil or residue on the lashes allowing for the best retention when used in partnership with our ULTRA BOND adhesive. For professional use only. Lash technician should apply a small amount to a micro brush or applicator and brush through the lashes from root to tip. Wipe off any excess primer, only a small quantity required. Do not remove the primer from the lashes, just excess.