Having worked with Charlotte Tilbury for years, it's fair to say Miller has picked up a few insider tricks along the way. What is the 'airbrush sandwich hack'? Miller begins by misting her complexion with Charlotte Tilbury's Airbrush Flawless Setting Spray. She then finishes with another veil of setting spray to lock everything into place. "I'm just going to use the Airbrush Setting Spray – so hydrating and nourishing.