M.A.C. Fluidline Eye-liner gel, color Blacktrack
This is a water resistant eyeliner.
I use this on my lower eyelid border and on the inside and outside of the eye.
Why I don't use it everywhere? For once, it's very thick so it's hard to work with and also I don't have the need to have super-water resistant eyeliner everywhere, and also it's a bit costly (approx. $18).
I do it as on this picture. As you can see I also do a bit thicker at the inside of the eye. I paint a bit outside the border, downwards. This is to create a more cat shape to the eye.
End of school :)