Duo Eyelash Adhesive, Dark Tone, Adding fake eyelashes is made easy with this Ardell duo eyelash adhesive. DUO is the best selling eyelash adhesive in the industry! Its designed for use with Ardell eyelashes, one tiny drop is all you need for an entire lash. This waterproof eyelash adhesive dries quickly and keeps your lashes in place all day long providing comfortable all day wear for strip and individual lashes. It goes on dark and dries dark for easy application. Just squeeze a tiny line of DUO adhesive along the lash band, wait 30 seconds and apply to lash.