Using this high - gloss foundation repair volume liquid is easy. First, make sure your face is clean and moisturized. Take a small amount of the liquid on your fingertips or a makeup sponge. Gently pat it onto your face, focusing on areas that need concealing, like blemishes or dark circles. Blend it well for a natural finish. As for precautions, avoid getting it into your eyes. If you have very sensitive skin, it's a good idea to do a patch test first. To maintain the quality of the product, keep it in a cool and dry place, away from direct sunlight. Also, make sure to close the bottle tightly after use to prevent it from drying out.