Joico K Pak professional cuticle sealer ph. neutralizer Joico K Pak professional cuticle sealer ph. neutralizer smooths and tightens the cuticle locks in curls and color and reduces ph. swelling to restore hair back to its natural state of 4.5 5.5. Cuticle is locked down and sealed. Any sign of swelling or raised cuticle is diminished. It deactivates and removes ammonia and peroxide residues while eliminating perm odors.