PC-7 and golf club makers epoxy work well for me with carbons, I let it cure 24 hours although 12 should work, the longer before it is moved the better. Clean non- contaminated surfaces are crucial to a good bond. I wash shaft and broadhead with dawn dish detergent rough up the carbon inside the shaft, then clean with 90% isopropyl alcohol available at the drugstore, don't use 70%. Acetone is good for removing water. I only use Ferr-L-Tite now for bareshafting as it is easy to reverse while shortening the shaft.