Blistering is another common wall painting problem. It takes place when the surface being painted on is wet. Thus, it's recommended that you check whether the surface you're painting on is damp and if it is, you must permit it to dry before applying any paint. This is another typical outdoor wall problem where the moisture in the atmosphere tends to settle on the surface, making it wet. As a consequence, when you start painting, the moisture lifts up the paint causing blistering.