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The best lash primers help you get the most out of your favorite mascara—hello, low effort. Whether your ideal flutter craves lengthening, separation, volume, or all of the above, the right primer makes mascara easier to apply and results longer-lasting and more noticeable. Like regular mascaras, these base coats come in a variety of wand shapes, pigments, bonus ingredients, and talents (yup, some even waterproof your standard formulas), making it tricky to pinpoint your perfect match. That’s why we checked in with editors, makeup artists, cosmetic chemists, and board-certified dermatologists to help you zero in on the best of the best. Ahead, shop our favorites, complete with our editors’ before-and-after pics. The proof is in the primer.