I am obviously last to the party but at the ripe old age of 36 I have just used a primer for the first time. Brilliant stuff! Can't believe nobody told me this. I have also recently witnessed a friend's dark under-eye circles miraculously disappear before my very eyes when she applied what I can only describe as "green stuff". Didn't get a chance to ask her about it because the kids suddenly needed attention and I forgot about it but what was it?? And if you all knew about this stuff and the primer, what else am l missing out on???