Damage not your fault, the tub has a finish applied. These are band aids at best. The re-finish has a maximum usfull life of about three years, generally after a year it starts to come up and quickly goes to hell. It is a defective finish applied by the owner or manager to hide a problem prior to your move in. He can either spray on an other coat or replace the tub. But key point is that the damage to the tub is a result of a band aid applied to the tub and not abuse by the tenants.