Here you can see there was a pretty sizable chunk of the chair missing.
After mixing up some Bondo, we trowel it into the damaged area
Next we get a rough shape of the chair
Then we refine the shape, and prep the Bondo.
Next we paint in a background color and get ready to in-paint, where we mimic the appearance of wood.
The finished product should be unnoticeable to the untrained eye, with the look, feel and durability of the wood, as if the damage had never happened.