Lottie London Buff & Blend Brush. Lottie London Buff & Blend Brush is a flat-topped, densely packed brush and is perfect for buffing finishing powders to skin, or fixing make-up mishaps in a pinch. Simply apply powder to your face using a buffing motion, evening out any base imperfections or soften any harsh blush and contour lines. BLEND AND BUFF your way to airbrushed looking skin.