Using this liquid foundation is easy. First, make sure your face is clean and moisturized. Take an appropriate amount of the foundation on a makeup sponge or brush. Gently pat or spread it on your face, focusing on the areas with spots you want to conceal. As for precautions, keep it away from direct sunlight and high - temperature places. Don't use it if your skin has open wounds. For maintenance, store it in a cool and dry place. After each use, make sure the bottle cap is tightly closed to prevent the foundation from drying out or getting contaminated.