There are other ways of fusing encaustic instead of the obvious heat gun, torch, or other electrically heated tool. Due to the radiating heat from the tool it is possible to fuse by heating up the metal with one of the aforementioned tools. It may seem odd to heat one tool with another when it is possible to fuse with the first; but, heat guns force air which can move the paint around and a micro-butane torch along with others are not small enough to fuse some areas. Heating a small metal tool will allow fusing of the tiniest area without disturbing it's surroundings.
See Metal Sculpting Tools and Burnishers for more about what kinds of metal tools.
See Metal Sculpting Tools and Burnishers for more about what kinds of metal tools.