Continue the hair renewal at home with the K18 leave-in molecular repair hair mask (5mL) Damage is ongoing, so your clients use of K18 should be too. Our at-home treatment helps to restore any damage to keep their canvas healthy, make their services last longer and maintaining their hair's integrity to make your job easier next time around. As a progressive treatment, hair gets better with each use. Shampoo, do not condition. Towel dry thoroughly. Begin with 1 pump of K18 Mask and add more as needed depending on length, thickness, and hair condition. Work evenly from ends to roots. Let sit for 4 minutes to activate. DO NOT rinse out. Style as usual.