Two main types of blisters: those caused by moisture and those caused by heat. Moisture blisters can be caused when moisture from inside a building is drawn to the outside walls because it has no where else to go. In summer, the sun heats the siding, and the water behind the film vaporizes. Blistering can also result when painting over a surface that has had insufficient drying time after exposure to moisture from rain, dew or pressure-washing. Unlike peeling problems, the moisture blisters can actually disappear afterwards and remain almost undetectable. Heat blisters result when the sun causes the outside of the coating to dry too fast, trapping solvents or water between the old and new coats of paint.
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