10. Top It All Off
A good — we mean good — top coat is hard to come by, so hold onto this Butter London Hardwear Treatment ($25) for dear life. It's fast-drying, doesn't go gluggy after a handful of uses, dries smooth and shiny and it's non-toxic. There's nothing worse than spending 30 minutes filing, buffing and painting to perfection, only to have it all destroyed by bubbly top coat. Wipe one thin coat of this magic stuff over painted nails for the glossiest coat you ever saw.