I must preface this Article by stating that as a rule, you should never apply paint to stucco! What can happen is that moisture can get between the paint on the stucco and the moisture resistant backing that is attached to the structure's studs. If mold forms there, it can move through the moisture barrier and into the home. There are many contractors in the area who are not experienced with stucco and will indicate that painting the stucco is not a problem. There is a small chance that you will never experience a moisture problem if you paint stucco, but is it worth that chance? Stucco is designed to breathe.
If your stucco is close to the bottom of your exterior wall, it's possible that ground moisture will come into contact with the surface. The moisture will dissipate through the stucco that is close to the foundation and become trapped between the paint and the moisture barrier. Then when that surface gets warm the moisture will expand and cause the paint to lift off of the stucco. Stucco needs to breathe!
We recently completed an Exterior Project in Alexandria for a Farm House that is 100 years old. To the Home Owner's dismay, the stucco was coming off in sheets. He indicated that the stucco was re-painted about 7 years prior. Our tests indicated that the original stucco was of an oil base form. What had happened was that the previous Contractor applied latex based materials on top of the oil based stucco. For those of you who don't know, this will never work. You can never apply latex paint on top of oil based paint, without extensive surface preparation. We provided a solution of a complete power-wash, oil base prime undercoat application, followed by a complete application of Sherwin Williams Marine Coatings Latex Bondplex.
We are confident that that Bondplex will provide adequate adhesion for those areas of the stucco that were beginning to fail. This was project was somewhat complex due to the age of the property and the condition of the stucco. Fortunately, we had the right experience to deal with these issues. If you are considering undertaking a project and would like a second opinion, please do not hesitate to contact Davinci's your Northern VA Painting Company.