I never used an eye primer until now, because it just seemed like too much hassle, and an extra (unnecessary) step in the morning. However, I can never resist anything from Prep + Prime, so I gave it a go, and am I happy that I did! Not only does my eyeshadow apply more evenly and smoothly with this at the base, but it lasts so much longer too. After about 9 or 10 hours, it was still perfectly in place, and without any creases. I don’t think I could ever wear my eyeshadow without it again!