Don't glue em. Sand your ends a little flat, then start your wrap on the front. the flat end of the feather will take the thread smoothly, and then wrap through the feathers. the backside is always the challenge. Take yer time, and about 4 or 5 wraps, put a half hitch in it, and loop it a coupla more times, then tie it off.
I started using clear finger nail hardener on the thread. That I can see, it works better than glue. I tend to put a good bit of helical in my fletching, and the wrap makes it look great. I don't even use a fletcher any more. wrapping looks much cooler, and is certainly stronger.
I use Excel braided fishing line. Usually 30# test, and up to 60, if I can find it. Works like a charm.
Have fun.