Hi guys, I just finished painting a 1700 sq. ft. home that I had hired a local guy to train one of my helpers to tape , and after we finished painting, we noticed every screw hole is showing (divits at every hole). My guy says that when the taper mixed the mud to fill the screw holes, he mixed the mud really thin, and I understand that is a no no. The taper is not taking any responsibility for this screwup and is expecting me to cover all costs of repairing this, saying that amateurs did the job and he is not responsible, even though his man mixed the mud, went over the screw holes personally the last time, and was the trainer of the job.
I don't know a whole lot about taping so I am not sure what went wrong with the application.
What does the drywallers' code of ethics say should be done?