Setting spray hydrates makeup layers, extends wear time, and locks makeup in place while preventing smudging, creasing, or fading. Depending on the formula, it can also control oil and shine, hydrate, or brighten.
No, setting spray should not make you look shiny unless specifically designed for a dewy finish. Other formulas offer a matte finish with shine control.
It is most commonly used as the final step in your routine to lock everything in and create a smooth finish, though it can also be used before makeup application or between layers.
A fixing spray acts like hairspray to lock makeup in place and increase wear time, whereas a setting spray melts makeup layers together for a natural, skin-like finish using hydrating ingredients (though advanced setting sprays often combine waterproofing and extended wear benefits).
Without setting spray, your makeup may look or feel dry and unnatural, and it becomes much more prone to creasing, fading, or smudging throughout the day.