I always use a foundation brush (or if I'm in a hurry, just my fingers). I've never like sponges, they soak up the product and you're supposed to use a new one each time because of bacteria, especially if you have skin problems like acne. The brush gives excellent coverage and if you want thicker coverage, you just apply another coat. I just wash it after each use, don't have to throw it away and buy more. I'd rather save my pennies for makeup!