Glossary Term
Blistering
Blistering describes the formation of small raised bubbles or pockets under a yacht’s paint, gelcoat, or outer surface layer. It usually develops when moisture, contamination, trapped solvent, heat, or poor surface preparation breaks the bond between layers. On metal yachts it may point to coating failure and corrosion risk, while on composite hulls it can also suggest deeper moisture-related deterioration.
On yachts, blistering may be limited to the outer coating system on topsides, decks, or superstructure, or it may indicate a problem below the visible finish. The cause matters because cosmetic paint blistering and deeper hull-skin damage do not lead to the same repair plan, timing, or cost.
The term is important because blistering affects appearance, resale value, and maintenance scope. It also needs careful diagnosis. A few isolated blisters after a paint defect are a different issue from widespread underwater blistering that points to moisture ingress and a more involved repair process.