This is a demo of the Ultra-Ever Dry coating, designed to repel liquid:
Like your smartphone screen, it's oleophobic — it repels oil.
But it's hydrophobic, too:
This particular coating isn't appropriate for smartphones — it's better for heavier hardware than glass. But it's reasonable to expect that, at some point soon, waterproof and fingerprint-resistant electronics will be commonplace. And it'll be in part because of super-slick coatings like this. You can watch the whole video here: