This is great to get the perfect finish. Here's what I do: moisturizer first. Followed by concealer and then a powder foundation. Problem is, when it is hot and humid, the moisturizer and concealer take longer to set and the power foundation streaks. Here is the FIX: moisturizer followed by concealer. Followed by a light dusting of finishing powder. And then apply power foundation. Boom. Smooth smooth smooth and lasts beautifully all day long. Thank you MAC!