I use the Eclat Miracle as a primer before I put on foundation (it's supposed to be paired up with Lancome's Teint Miracle, but I'm sure you can use any foundation with it), for a perfect skin, radiant look. With just the Eclat Miracle serum on, your skin does really look dewy and radiant. Sort of like a "I just worked out" glow without the sweat :). The serum is packed full of light reflecting pigments that makes you glow. I haven't tried it as a "highlighter" but that is one of it's uses.

Just use your fingers to apply the product. No brushes needed.