Why some eyeshadows dont adhere to the eyelids....

I've gotten this question, of recent, a number of times.. so I've decided to share this information with you.
There can be a number of reasons but here are Four main reasons.. (feel free to leave a comment below sharing your secret :) )
1. Primer:  You need to use an eye primer - the elf eyelid primer does not work well with everyone for some people its a hit and others its a miss (not good) for me personally i used urban decay primer potion or too faced shadow insurance.. people generally always opt to try the cheaper ones first .. but investing in a good primer is ideal.. many times when i tell people about the higher-end brands they would inform me that they would see others using cheaper ones and it works.. its important to know that not all skin types will adapt to one product you may need to change your primer..
2. you may need a base like the NYX jumbo eye pencil or MAC's paint pots/shade sticks.. most shadows (and especially pigments) need something to stick to.. with the primer it just helps the lid to have a "flat" surface for your eyeshadows/pigments to go on.. it also helps with wrinkles and fine lines .. but with the eye base it creates a surface for the shadows/pigments to stick too
3. Lastly, it can be your brush.. if your brush bristles aren't firm and fluffy you will get a very sheer application the stiffer the bristles are packed not stiff to scratch but how dense they are pack together for example elf eyeshadow brush or mac's 239 brush bristles are densely packed and they give great pay off and helps to pack on eye color
4. Application of eyeshadow/pigment (thanks Maryam for reminding me) if you sweep the eyeshadow on to your lids you will sweep away the color if you pat the eyeshadow/pigment on it adheres to the base better..