How to use The Face Shop Real Nature Red Ginseng Sheet Mask: First things first, put your feet up and relax. Sheet masks give you the chance to have a quiet moment - a time to be introspective, unwind and find a small moment of peace. 1. Apply sheet mask onto your face 2. Leave on for 15-20 minutes 3. Apply any residue essence onto your neck and hands for an all purpose treatment.