I am looking at painting a 1925 house with many layers of cracking paint.I have used a wirebrush on a small area and it comes off in some areas, but not in others. I am also looking to use a pressure washer to take off more. My real question is can elastomeric paint be painted over old paint? Do I have to prime? Can it be used on wood? Hope someone has some ideas and other helpful hits about painting this house. The house is Stucco.