Always apply an eye shadow primer BEFORE your eye shadow! Not only does it help your eye shadow last longer and not crease (nothing is worse than seeing a girl with creasy eyelids), but it also helps fill in any lines to make for a smooth, even canvas. My favorite has consistently been Urban Decay’s Primer Potion. It dries quickly, lasts for 24-hours and doesn’t contain any parabens. They have changed the packaging over the years and added different shades, but it is still the best eye primer in my opinion.