Magnetic lash liners are sold as liquid eyeliners (liquid-form magnetic liners).
The formulations list hydrating ingredients including biotin, hyaluronic acid, and vitamin E.
Shake the liner, glide it along your upper lash line, then wait about 30 seconds (until the liner feels tacky or mostly dry) before applying the magnetic lashes.
They use a precise felt-tip applicator; one formulation specifically notes a redesigned ultra-fine felt-tip for added precision.
Wait about 30 seconds after applying the liner, or until it is mostly dry/tacky, before placing the magnetic lashes.
Remove the liner using a waterproof makeup remover.
Product information lists a suggested age of 13 years and up.