This seems like it wants to be a dupe for the Smashbox Priming Water, but I do not have that so I can not compare the two.
The Hard Candy Primer Mist can be used under or over makeup. I like to use it both before and after I apply makeup. This does act as a primer, as it helps concealer and foundation apply smoothly and last for around 8 hours. This also help remove the powdery look, that makeup sometimes has. Hard Candy Primer Mist is more gear towards people with normal or dry skin, or anyone looking for dewy skin.
This is free of silicon and alcohol. Also it has coconot oil, so it does have a light scent of coconut, but it fades quickly. Being priced at $10 for 2.2oz, this is a good way for trying a primer water.