Joico K-Pak Professional Cuticle Sealer , this double-action pH neutralizer and cuticle sealer is an acidifier that smoothes and tightens the cuticle, and locks in curl and color. The low pH formula reduces hair swelling caused by chemical services , such as tinting, lightening, straightening and perming. It deactivates and removes ammonia and peroxide residues while eliminating perm odors.