The new redken extreme lengths sealer with its unique built in brush applicator is the long awaited solution to help prevent split ends from forming resulting in breakage used in conjunction with the extreme primer it can help preserve up to 6 inches of hair length ideal for fans of the redken extreme range who suffer with hair that is brittle damaged and prone to breakage the extreme sealer is the second step to restoring hair length so if you have difficulty growing your hair due to e