What Exactly Is Eyeliner Primer? I Tried 2 Different Versions

I know exactly what you're thinking: Eyeliner primers exist? Trust me when I say I thought the same thing. Then, I quickly questioned the point of them, which made me think back to the time before I discovered my holy-grail eyeliner (Bless you, Stila Stay All Day Waterproof Eyeliner). It was a bunch of failed attempts at a jet-black cat eye that would fade to gray after a few hours. By the end of the day, it was barely there. Those were some sad days. So I guess if you haven't gotten your hands on a long-wear eyeliner that works for you yet, there's a need for a primer so your liner stays put.

After a quick Google search, I found out that they kind of exist. Interestingly enough, there isn't a product online that's solely marketed as "eyeliner primer." I used my keen sense of judgment and found two products that were close enough. This is where Urban Decay Ultimate Ozone Multipurpose Primer Pencil comes in.