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Hi Jason!
After washing, your backcombed hair may loosen and some sections (particularly those comprised of your softer hair i.e. right behind your ears) may come completely out. That happened to mine, anyway. This is probably going to be really frustrating because backcombing takes a long time and is very painful BUT DON'T WORRY! You don't need to re-backcomb or anything just be patient and let the loose hair dread up on it's own. I had trepidations about washing my backcombed hair at first but after I started washing regularly I noticed, at first that my sections got looser, but then that my sections started to actually lock up tight. You'll realize after a while that your backcombed hair is really just tangled hair, not actual dreadlocks. All you need to do to get those sections of tangled hair to turn into dreadlocks is keep your hair clean.
Hope that was helpful. Also, as many dreadies on here will tell you, palm rolling is useless. Truthfully, it's not really useless. It will round out your dreads for a little while, and if you persist in rolling every day it will keep your dreads round. But really, Jason, do you really want to spend 30 min. to and hour of your day fucking with your hair? The best part of dreading is that you don't ever have to dick with your hair. I stopped rolling and not only did it free up some time it also made my dreads look unique; it's a no-brainer. Ever try to paddle a canoe up white-water rapids? That's what palm-rolling your dreads is gonna be like.
Good luck with your dreadlock journey, Jason.
Happy dreading!