The surface of the concrete is powdery, and when rubbed with hands, it falls off, and when rubbed with feet, it becomes dusty.
Some people don’t take it seriously and think that sweeping is enough.
They wait until the first party inspects the house and draws a mark on the wall with the key, and then wait until the floor is finished and the epoxy peels off before they think about finding the cause.
It’s too late.
.