Setting sprays and powders are used to:

1. _Set makeup in place_: Prevent makeup from moving, fading, or getting oily.
2. _Extend wear_: Make makeup last longer, even through heat, humidity, or tears.
3. _Control shine_: Mattify or reduce excess oil and shine.
4. _Add a barrier_: Protect makeup from environmental elements and touch.
5. _Enhance finish_: Set a smooth, even finish and prevent cakeiness.
6. _Prevent creasing_: Stop makeup from settling into fine lines and wrinkles.
7. _Keep makeup fresh_: Keep makeup looking fresh and newly applied.
8. _Help with makeup longevity_: Make makeup last all day or night.

Setting sprays are typically used:

- After applying makeup to set it in place
- Throughout the day to touch up and refresh makeup

Setting powders are used:

- After applying foundation or concealer to set and mattify
- To absorb excess oil and reduce shine
- To set eyeshadow and eyeliner in place

Both setting sprays and powders help ensure a long-lasting, flawless makeup application.