I recently moved and will be painting many rooms. I have high walls in the foyer that connect to the DR, LR and Family room. I’d like to use colors in all three rooms and a neutral in the main foyer. Where does the neutral end and the colors for

Do you have to sand between top coats oil paint around windows outside?

We have stucco buildings in Florida, they are about 25 years old and are experiencing many cracks in the walls which we have been caulking but cannot keep up with as these cracks lead to water intrusion in our units. Will elastomeric paint solve this problem?