Do mascara primers really work? We put four to the test on camera. Lash primers are designed to work like a really good pair of underwear, prepping your lashes for mascara, making them longer, blacker and more voluminous than ever. But do they really work, or is it just another makeup step we don't need? We picked four of the best lash primers and four of our most willing Cosmopolitan Editors to put them to the ultimate test... On camera. Estée Lauder Lash Primer Plus, L'Oréal Paris Lash Paradise Mascara Primer, Clinique Lash Building Primer, Givenchy Base Mascara Perfecto.



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