Spray foundations sound nice in theory, but also, like—how are you really supposed to use them? Do you spray them directly on your face? Spritz them on a brush, then buff all over your face? Apply with a sponge? Mist and walk through, body spray-style? (Jk.) So many questions. Luckily, cool-girl Hanneli Mustaparta is here to show us the ropes. The model/blogger teamed up with Dior and Sephora to show exactly how you’re supposed to use the brand’s new Airflash Foundation ($62). Hint: it's a lot easier than you might think. Click the video above to find out her technique!