For someone who’s one and only requirement for eyeliner is that it stays in place, this cake liner would be an awfully unusual choice.
And yet, the color is so phenomenal that it might be even be worth leaving around to look at, regardless of whether I ever use it.
I exaggerate. It looks much better on the eyes than as room décor.
Laura Mercier Tightline Cake Liner is completely dry and needs water or special solution to apply. LM sells solution that makes the liner waterproof, but this liner was already ridiculously expensive for the piece of watercolor that it essentially is. I didn’t bother doubling the charge to get the “Activator”, so I suppose if I complain about staying power, I only have myself to blame. There are comparable solutions by other brands that may be less expensive and equally efficacious but I cannot testify to that. (The last time I checked, these kinds of “eyeliner sealants” or “eyeliner transformers” are almost exclusively high end.) All I know is that if you put droplets of LM solution onto your cake liner, you can no longer use water to pick up the pigment from that point on. It seals the cake liner from water, which is a pretty logical consequence if you think about it.
I personally use water, and with a little work, my end result can look just as polished as those of other liners. The finish reminds me slightly of chalk, but it stays much better than that. In fact its performance is pretty solid until the 5th or 6th hour mark when my lids start to get oily enough to interact with the product. After that, it can go pretty downhill. Do not wear this on those 12 to 16 hour days, because touch ups will do nothing. The color will migrate and move around the whole eye area, the clean, sharp edge will disintegrate, and so on.
Above: This is the chalk-looking finish. The color in this picture is not too accurate. It should be greener and darker.


A square of this liner is $23 in most places like Laura Mercier online and Sephora, though Sephora's color selection is limited. This is also the case with a few department stores. Bloomingdales notably has the full line of 8 colors and also peculiarly prices them a dollar cheaper at $22.