On clean skin, apply a few drops of your favorite serum to the area to be covered. Be careful to just use a small amount of product. Gently pull skin flat in desired area and apply masks. Add light pressure with your fingers to press them into place. Wait for the desired amount of time (10-20 minutes or overnight if desired!). Remove masks and immediately wash the silicone masks with light soap and water. For best results, let air dry print side down (sticky side up). Return to their tin for storage.