How Long Does An Eyeliner Pen Last
The liquid eyeliner should be used up within eight months of opening. If this time frame is exceeded, it is better to avoid using the eyeliner again because it touches the skin of the eyes and becomes contaminated with bacteria after being exposed to the air.
When not using the eyeliner, secure the cap. Keep it out of direct sunshine and away from light at the same time. The best way to store it is tip-side down in a drawer.
Do Eyeliner Pens Dry Out?
Your eyeliner may have dried out for one of two reasons: Perhaps it has to do with how you keep it or the quality of the formula you are using. (In fact, experts advise keeping liquid liners upside-down to maintain the ink saturation of the brush or felt tip.) Maybe you neglected to fully re-cap the gel or pen. (Everyone has experienced it.) Fortunately, there are easy do-it-yourself methods to restore dried-out eyeliner, allowing you to prolong the life of your cosmetics.

How to Prevent Eyeliner Pens from Drying Out
Tip | Description |
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Make a Drying Liner Better |
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Switch Up Your Items | Rotate your makeup supplies to avoid stale, dried-out ingredients. |
FAQs About Eyeliner Pen Lifespan |
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Conclusion
Regarding pen eyeliners, I’ve found that some brands last longer than others, and after 9 to 12 months (after they’re opened), they begin to dry out. I keep the nibs of my brown pens and pen eyeliners moist by storing them upside down. Moreover, KVD advises cleaning the nib with a paper towel after use to prevent eyeshadow from clogging it.