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Few ingredients add more shine than this glossy polymer, but it can weigh hair down if it's not used correctly, says cosmetics chemist Ni'Kita Wilson. For thin hair, pick a spray formula, like John Frieda Frizz-Ease 100% Shine mist ($6; at Rite Aid), and gently mist onto damp hair from mid-shaft down. For thick hair, work a pea-size drop between palms and distribute evenly through damp hair. If your hair is coarse or kinky, add a bit more product to ends once hair is dry, or try a heavier natural oil.