Does such a thing exist?!? I'd love to know. Any white eyeliner I've tried has been rubbish and disappeared on me completely. I really want to use one on my bottom waterline.
milk (nyx) is awesome but it's a fat crayon stick, i use it as a primer more than anything.
i used to have a wet and wild white eyeliner that stayed on forever.
Manic Panic's Virgin eyeliner is my HG of white eyeliners. It will fade a little after you've blinked, which I actually recommend so that your eyes don't look yellow by comparison, but you can just reapply and it'll stay Hella-white on the waterline for at least a few hours. I've used it on all of my models, female AND male, to make their eyes pop.