Select a hardener for its intended use and for the cure speed best suited for your job in the temperature range in which you are working. As a rule, use higher-density fillers when bonding higher-density materials such as hardwoods and metals.
Any of the adhesive fillers are suitable for most bonding situations. The choice of a filler for general use may be based on the handling characteristics prefered. Fillers may also be blended to create mixtures.