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Evian Facial Spray
"I can't live without this stuff—personally or in my professional kit," says Rebecca Restrepo. Like many makeup artists, she spritzes it over the skin (holding the can several inches from the face) after applying foundation, for a fresh, dewy finish. The light mist of water also helps set makeup so it stays in place all day. When skin is really dry, Restrepo recommends a spritz of water before applying face lotion, too, for extra moisturizing.

$6.50 for 1.7 ounces, amazon.com