L'Oreal Base Coat.
It just plain sucks. It's thick and sticky and has been since I bought it. The thickness makes the dry time for my nail polish go up by about a half hour (if it dries at all!)
It doesn't seem to make my polish last any longer AND to add insult to injury, the brush has come up one of the slits in the side of the wand and now is all fanned out and f-ed up which makes application a b*tch.