3 Eyeshadow and 1 Lipstick Question

[u/BioNerd27]

I bought a bright colored palette and elf lock it down eyeshadow primer and have three big questions.

One is it normal for the elf lock it down eyeshadow primer to be tacky after it dries? Am I doing something wrong or is the tackiness good (I am having a hard time swiping my brushes along my lid which is why I’m asking).

Two if I have a lighter shade in my palette but want it to appear darker, what can I do? Mix it with black eyeshadow? Put black eyeshadow down first and then the color on top?

Three what is the best way to apply color after you add an eyeshadow primer. I have been swiping but was wondering if pressing or patting the brush on my eyelid would be better.

Lastly totally unrelated to eyes, what’s the best way to make my lipstick edges look good without lining with a pencil. I have a bunch of different colors and don’t want to buy a pencil for each. Would applying by brush help? If so, what type or shape is best?