I have really really oily lids and I heard from my friends that this is a eyeliner that will stay on even on the oiliest lids, so of course I had to try it. I've been wearing it for 4 hours now with no primer or anything and I still can't see any smudges, usually my eyeliner would be smudged by now so I'm very impressed! The brush is soft and precise, perfect for drawing both thick and thin lines. However when I pressed a tissue against my eyes to wipe away tears yesterday some of the eyeliner came off, so I don't think it's totally waterproof. Overall this is a great eyeliner and I would definitely recommend it