THESE days, there are a seemingly endless lists of products we simply must have in our make-up bags.

It can be tempting to skip buying some products, like contouring kits and lip liners, to cut costs - but that illusive primer may be more essential than you'd thought.

 You've probably been applying your make-up all wrong, and it's to do with your foundation

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You've probably been applying your make-up all wrong, and it's to do with your foundationCredit: Getty Images

Primer is a cream or lotion, usually applied before your foundation, which is meant to improve coverage and make sure your make-up stays set for longer.

However, according to the make-up experts, your should be mixing your primer with your foundation.

This simple tip will help your cream foundation blend into your skin, and ultimately prevent your make-up from looking caked on.

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 Estee Lauder's global make-up artistry director Blair Patterson (pictured) and other beauty experts advise mixing your foundation with primer

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Estee Lauder's global make-up artistry director Blair Patterson (pictured) and other beauty experts advise mixing your foundation with primerCredit: Getty Images - WireImage

The 'natural look' tip comes just months after we were told wearing too much make-up is one of the things which makes women less attractive to men.

Another pro is that mixing your foundation will make it last a lot longer, and should save you money in the long-term.

The tip has been backed by Estee Lauder's global make-up artistry director Blair Patterson; Gil Romero, an instructor at Napoleon Perdis' Make-up Academy in Hollywood; and Cristina Bartolucci, chief creative director of NYX.

Christina advises using a 50/50 combo of foundation and primer, or 2/3 foundation to 1/3 primer for more coverage.

You should mix the two liquids in your hand, before dotting it onto your face and blending.

Think the primer leaves your face looking a little shiny? Simply dust powder to set.

If you're still searching for your perfect make-up match, this Lancome foundation promises to revolutionise your routine by using facial scanners.

And if you are a full-coverage kind of girl, and don't think this tip is for you, you may want to invest in this product, which promises to make tattoos disappear, for your beauty bag.