I don't seems to get much reviews on this, therefore I give it a try. The ELF Studio Eye Primer and Liner Sealer. This product comes with two sides, the 'prime' which works as eyeshadow base/primer and the 'liner' tranforming your eyeshadow into liquid liner.
You can get 2 products in about a size of a tube of mascara except it is bulkier. The primer was nude and matte in color. It was like a big round crayon which you swipe on your eyelid and blend it with the fingers or a brush. One or two swipes is more than enough as too much of the primer will make it looks cakey. So far, no creasing or fading happen when I applied this on. The only bad was it does not darken the color of the eyeshadow as UDPP does. One thing I do not like is it has a strange smell, much like latex smell.
The best invention I like about this product is the sealer. It transform any of your eyeshadow into liquid liner. I tried it with lots of eyeshadow colors and it worked like magic! Black, blue, green, yellow. You named it, you get it! Can safe a lot of money from buying different colors of eyeliner with this.
The sealer comes with a stiff sharp shape which you can even draw the inner corner of your eyes. I've tried it buy using the black eyeshadow and golden eyeshadow during dinners, after 6 hours it does not smudge. NO SMUDGING even it's on my undereyes. :) The tips of the sealer can be cleaned off easily by using makeup remover. Therefore, you can used it over and over again.
Overall I love this product. I personally hope that it just came in one product which contains only the sealer. For the price, this product is worth. Especially for those who likes to have fun with colours.