why primer is used in make up? i mean what its main purpose to use it?

Why primer is used in make up? i mean what its main purpose to use it?

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It keeps your makeup on all day, so you do less touch-ups. Also, it fills in fine line, pores, uneven texture to give your skin a smooth, flawless look!
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It helps your foundation glide on and stay on all day. Your foundation will adhere to the primer therefore creating smoother, more even texture. I wear it everyday.....my favorite primer is Laura Gellar "Spackle"!
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it sto keep your makeup from smearing and coming off and helps your makeup to stay fresh all day...i dont use it all the time unless im going out all day and know i won't have time for touch ups
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Just like you prime a wall before you paint it, you can prime your face before you apply foundation. Primers work much like a moisturizer under your foundation does: they ease the application of foundation and are meant to create a barrier between foundation and skin.

Makeup artists swear primers go one step further than moisturizers: They'll even out skin tone, help your makeup stay on longer and absorb oil with salicylic acid.
Other benefits of foundation primers, according to Laura Mercier, include:

They allow foundation to "stay put" in hot weather.
Help prevent skin from absorbing talc and pigment from your foundation as well as preventing talc from drawing oil from the skin.
They contain botanicals such as lavender, orange, jasmine, rose, geranium, grape, kiwi and aloe extracts to soothe and refresh the skin.
Using a primer underneath foundation helps you avoid "cake face."
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