So let me start by saying I have used nearly every eyeshadow primer available. From high end to low. Mac, Lorac, Urban Decay... they don't hold a candle to Thank Me Later. I have very oily skin. Using this primer, shadow lasts a full 8 hours or more. I could get maybe 5 or 6 out of the other brands, if I'm lucky. I got this as a sample in my ipsy bag, and I had to buy the full size product straight away! I couldn't be happier with my purchase. Thank you Elizabeth Mott for finally making a primer that lasts! I love this stuff!