I don't want my pitch glue to be sticky to the touch except when I heat it. That is why I start with hard, brittle pitch. If the pitch I have is sticky I cook it until the volatile oils(turps) have disapated. I use finely ground charcoal to add body to the pitch glue and bees wax to make the pitch less brittle. If you use just hard, brittle pitch it can easly crumble, dislodging the head or blade.
My pitch glue is added to the shaft and head by melting it and dripping it where it is needed. By heating it it becomes sticky so it will adhere to almost any material and when it cools it looses it stickiness but will still remained attached to whatever it is put on. If for some reason the head or blade becomes detached or loosened a little heat on the point or blade will slightly melt the pitch allowing it to re-adhere to the stone and/or wood(or antler or whatever).
If you use sticky pitch it will remain sticky until the turps disapate which could take a while and in the mean time it will collect any foreign material that comes in contact with it like lint, leaves and grass or whatever. The way I was tought to make pitch glue will not pick up "trash" after it has cooled. That is why I make it the way I do, using hard, brittle pitch to start with.