EndIessRAlN
Super Freak
I did it twice only leaving it for a few minutes and they always popped back to "normal". Finally did it leaving the bands on for a day.
I tried to avoid rubber bands because they tend to leave a crease in the dreads. Instead as an alternative, I used a small and long piece of cloth and wrapped it around the preds head very lightly. I also used hot boiling water which I left it in there for maybe...2 minutes or so. Then when I took it out I just waited a few seconds and drenched it again in cold water before releasing the cloth. Didn't have to wait overnight at all.