● Waterproof eyeliner offers stronger resistance to sweat, tears, humidity, and water. ● Water-resistant eyeliner is better for light moisture and casual daily wear. ● Oil, rubbing, and skincare residue can still weaken waterproof eyeliner. ● Clean, dry lids improve the grip and wear time of waterproof eyeliner. ● A waterproof eyeliner pen is practical for precise summer eye makeup. ● Thin layers usually last longer than thick, heavy lines. ● Oil-based remover is best for removing waterproof eyeliner gently. ● The right choice depends on climate, skin type, and wear occasion.