To repair a paint blister, first cut open the blister and break away the paint. If you discover bare wood, you know the blister is caused by moisture in damp wood that was trapped behind the paint seal and fought to get out.
If the surface beneath the blister is painted, paint solvent was probably trapped under a surface layer that dried too quickly.
Blisters are often localized, so complete repainting may not be necessary. To avoid either of these problems in the future, scrape the blistered area, sand it smooth, make sure the surface is completely dry, and then prime and paint. Do not paint in direct sunlight.
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