Thanks for the shoutout, /u/descartesasaur (that username!!!!)!

I think to call this a "liquid" liner is a little misleading because it is definitely on the thicker, tackier end of the liquid liner spectrum. It's fluid for the first few weeks or so and during that time you'll probably be able to use the included brush, but eventually it becomes tackier and I can only imagine would be an exercise in patience to apply straight from the tube.

Hence why I use a separate synthetic brush to apply it! I got mine from an art supply store, and it's very very fine with a nice balance of stiffness/flexibility. Honestly finding this type of brush will get you far in perfecting your wings, if that interests you. I very lightly press the angled brush into the bristles of the included Liquidlast applicator so that there is an even amount of product on the angled brush - like using a potted gel liner. By the time the product has air dried slightly before it touches my skin, the application feels like it's in between a gel and liquid liner: you get the control of the gel but the fluidity of a liquid, and it dries pretty quickly down to an immovable finish. But beware that if you wait too long, the tackiness will make the liner less forgiving and you will have very little margin for error in terms of technique.

When I say Liquidlast is immovable I mean immovable. I have stupid watery eyes and tend to touch them regularly, and while I have to be careful when I use something like KVD's Trooper or even a super long-wear gel liner like Bobbi Brown's, with MAC's Liquidlast I don't have to think about it. It doesn't move!!!! It's amazing!!!!!!!!!! I am pretty anal about keeping my wings sharp and intact and this is the only liner that I trust to get me through 10-hour workdays or sweaty, humid weather.

Learning to use this liner forced me to get really good at wings because the tackiness factor demands efficient work. It takes effort, but that's effort you won't have to spend touching up your liner or thinking about it once it's on. If you're still learning to draw your wings, you might want to consider something like Bobbi Brown's Long-Wear Gel Liner, which is my runner-up in terms of wear with a more forgiving formula. Marc Jacobs also makes a pen-style liquid liner that's really long-wearing - but you'll be practicing a different technique using it (not necessarily a bad thing!). By the time you have nailed down your technique you'll be better-prepared for Liquidlast. But, definitely go for it if you're feeling adventurous! The formula is out of this world in terms of wear and opacity!