Gluing the edges completely stops the fray, if you want to give it that slightly frayed look then you should glue between the frayed edges that have already started.
My friend went as Doctor Salvador and we didn't figure this method out until after the con. ^.^;;
"This is my BOOMSTICK!"
"Klaatu... Verata... Nnnn... Uh."
"Good, bad, I'm the guy with the gun."
"Who's laughing now? WHO'S LAUGHING... NOOOOOW!?"
"Yo, She-bitch, let's go.'