I use sinew, artificial sinew or silk thread to haft points. I usually set the wraps with super glue.
3Rivers sells silk thread.
Gut hafting material is very strong but I believe it is too thick(bulky) for hafting points. As was said above, make the transition between the shaft and point as smooth as possible. I usually do a 5deg taper, like for a glue on point, slot it and haft the point. After everything is lined up, I use a sharp razor to make that transition even better then seal the wrapping. Pat