This is a smaller travel version and contains 3.7 ml of product. You really need just a tiny bit to prime both eyelids so even this small tube easily lasts for a year and I use it pretty much everyday. If you use too much primer, the eyeshadows applied over will look patchy and uneven. The product inside has a beige-skin color to it and leaves a velvety layer on the skin that is not tacky, but still makes eyeshadows adhere to it better, helps with their longevity and pigmentation. I know that some people can just use concealer as a primer but that doesn't work for me at all. If I don't use a primer, I usually notice eyeshadow creasing on me within the first three hours and because I have hooded eyes I often also notice eyeliner transferring to the upper lid.
I've also tried their other tinted and shimmery versions of eyeshadow primers in sample sizes that came with other palettes and I also really liked their Sin primer. I've also tried a couple more affordable ones from the drugstore (ArtDeco and Catrice) but nothing comes close to this eyeshadow primer from Urban Decay in my opinion. It prevents creasing, transferring make up to the upper lid and in general just keeps everything looking as good as first applied for everywhere between 10-12 (or even more) hours. They actually promise 24-hour wear without creasing, but I tend to remove my makeup after 12-14 hours so I can't say for sure.
How it looks on the skin: