The glue or knot seem a lot easier than the method I used to use when I used synthetic hair for my braids. I would have a candle burning nearby and a bowl of water. Of course you must excercise caution so as not to create a bonfire with your head. I normally did this at the very end. I'd take each braid in turn, securing all the others with a scrunchy, and hold the end of the hair to the the candle flame so it sorta melts (happens fast) and then I'd dip my fingers in the cold water and roll the molten part between my fingers twisting it to form a neat pointed end. If I didn't want it too pointed or if I had any parts of the molten hair stretching like a web, I'd use a pair of scissors to tidy that up. The rythmn of the fingers isn't hard to learn: dip-roll-dip (It's not easy to forget the dip! LOL) Your fingers do get a bit of minor burning but one does survive the experience.LOL Besides when you see the finished the end-results a touch of amensia does set in such that you forget you swore you'd not put your fingers through that again and find yourself repeating the process the next time you do the braids. LOL
On second thoughts... In this day and age, I'm sure somewhere out there someone has to have invented a tool that could be used to melt and bond plastic/synthetics so you wouldn't have to burn your fingers. I just haven't bothered looking. Maybe a Mechanic or Home Depot employee could suggest something the cuts and seals with heat?
With human hair, I've never bothered to do anything to the ends. They may unravel if your hairpiece is very silky, but usually after awhile that stops. And if you have hair like mine and it's natural, the part of the braid that has your hair usually hold well and the unraveled part doesn't look bad for micro braids. Otherwise you can just keep re-braiding the part that's undoing itself yourself till your hair pays attention to the rules you're setting. And it will, for it's only when it's brand new that it'll drive you nuts. Maybe a holding spray/mousse can help, but I've never needed to use one.