I used to glue razor blades on to a broadhead with contact cement, used pliobond when I could get it. I would put coat of glue on the broadhead and one on the razor blade and let it dry. After drying added another coating of glue to broadhead and blade, while still wet placed the razor blade on the broadhead and squeezed with a pair of pliers. The bond was almost instant, usually clamped them in place overnight with the bulldog type paper clips. Made for one very wicked and sharp head.