Keep water away from your lashes for the first 24 hours after application or touch-ups. Water can weaken the adhesive before it is set and cause lashes to fall off. The after-care varies depending on the glue used. For instance, with glue for sensitive eyes, oil-based products or makeup removers around the eye area are not recommended. Using water-proof mascara on the extensions is not recommended for any type of glue, as it is hard to remove and can actually pull off the lashes prematurely when trying to take it off.