you can do it either way.
some guys use a thin sheet of plastic around the adapter and friction fit it to do their testing.
i use the hot melt, this is what i use on all my shafts anyway. the nice thing about it, is if you want to index your broadhead blades to sit a certain way, you just need to heat it a bit and rotate where you want it.
I even stump shoot with inserts mounted with the hot melt and have never had a problem, but i do use a 1/2" alum footing behind the inserts, makes a huge differance.