Bond Sealer No.4 is a serum for the hair for professional and home use. It creates a protective barrier on the hair’s cuticles, which is capable of maintaining moisture and prolonging the repairing effect on the disulphide bridges created by the previous Link-D steps.

Distribute into damp hair with a comb. Use according to treatment instructions together with Bond Magnifier No.2 and Bond Keeper No.3.