Flat and stain finishes are typically used on walls and ceilings. Flat paint hides imperfections on walls and can generally be touched up; however, they can not be cleaned. Satin paint has a higher sheen, does not hide imperfections on your walls well, and cannot be touched up. It can, however, be cleaned with soap and water. Satin paint should be used mainly in kitchens, bathrooms, and high traffic areas. Flat paint is popular on ceilings, in low traffic areas, and two story walls.