If we tell you that preparing surfaces to be painted take as long or longer than applying the paint, would you believe us? Believe it. A successful paint job starts with choosing excellent materials, but the prep work can not be neglected. If so, it can make the paint job difficult to maintain. Surfaces not properly prepared results in poor coating adhesion.
Which method of surface preparation depends on the substrate, environment, and the expected life of the coating system. Depending on the situation, a painting professional can advise on which method will be best.
Basically, the surface must be dry and in sound condition. Steps will be taken to remove mildew, oil, dust, dirt, loose rust, peeling paint or other contaminates that would prevent good adhesion.
Obviously, no exterior painting should be done immediately after a rain, during foggy weather, or when rain is predicted. Although, most coatings are now formulated for low temperature use. Unless the paint clams it can be used down to 35°F. Exterior painting should also be avoided if the temperature is below 50°F.
Remember, prep before you paint!