First, the impact mark/point is tidied. The break is then dried to remove any moisture present.
Once the optimum working temperature is achieved, most of the air is removed from behind the impact:
The resin injector is positioned over the break for the next step:
A pressure (and if needed, vacuum) cycle is applied to remove any remaining air and the resin is cured under Ultra Violet light. The final stage is to fill the impact crater with a finishing resin which is also cured under a UV lamp.
A textbook bullseye and one of the easiest to repair.