I think its a personal decision as well. If a person relaxes their hair every 6 weeks they're exposing their hair and scalp to the chemicals 8 times a year!!! I would be very concerned with protecting my previously relaxed hair during the rinsing stage. Like mariaat said, it will seep in no matter what you do. the relaxer, by design is meant to penetrate the hair. I normally wait 12 weeks between touch ups, but that because its comfortable... i dont have to do any extra special tactics to get to this point and i have 4a hair. BUT if my hair is breaking and wont respond to any of my usual after 8 weeks treatments, I WILL relax it, but no sooner than 8 or 9 weeks.