The reason already is obvious , maybe they did not let it dry or applied thick coat. It has been humid but sunny everyday only today it got cloudy. It is very mentally draining to get this all done, there are people everywhere in your house, there is dust, noise, no peace , you endure it for 4 days expecting things to get better and then this happens. I live with my mother who is a heart patient and 70 years old, more than money its the inconvenience of getting work done that is the problem.