If you struggle to put on your eyeliner because you have single eyelids or mono eyelids, or your eyelids hide your eyeliner (story of my life), well, here is a hack that would help you to draw really fast. Use gel or liquid eyeliner to draw a thick arch so that when you open your eyes, you will have perfect lines. I have tried it and it works! Yay.
I like to use Missha eyeliner from Korea. It is precised for drawing thick and thin lines and strong against water, seat and sebum.