Guys that fly indoor 3d foamies glue there props all the time, were talking geared electric here not a big glow motor. Most of the time the big orange props break at the outer 20% of the prop. You can glue the cracks and they will hold. Sure they wont be perfectly balanced but it is a 14 oz plane, people fly them with bent propshafts, gears with teeth stripped etc. Do not do this on a conventional prop and glow motor, too many rpms, thicker , heavier plastic and loads of torque throwing at someone