Joico K-Pak Cuticle Sealer 1 Litre is a professional pH neutraliser and acidifier with a unique double-action formula that smooths and tightens the hair cuticle. It also helps preserve curl and color by reducing hair swelling caused by chemical treatments like tinting, lightening, straightening, and perming. Additionally, this sealer eliminates ammonia and peroxide residues and the unpleasant smell of perms. Its carefully balanced formula contains 19 essential amino acids, which quickly and effectively protect and reconstruct hair from the cuticle to the cortex.