Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Hull photos
- Coating history
- Survey report
Step-by-step instructions
Identify the coating layers
Find out whether raised spots appear in antifouling, barrier coat, gelcoat or deeper laminate.
Record size and pattern
Photograph locations, distribution and whether blisters are new or have changed across seasons.
Review storage conditions
Long periods afloat, incompatible paint coatings or previous repair work may influence the appearance.
Avoid premature grinding
Have a qualified surveyor determine whether the issue is coating adhesion, localized water intrusion or osmotic blistering.
Plan a proportionate repair
Use findings to choose spot repair, coating replacement or a larger laminate treatment if justified.
Safety note
Blister fluid and sanding dust may be irritating or hazardous. Do not puncture or grind extensive areas without safe containment and protective equipment.
Key takeaway
The word blister describes an appearance, not a diagnosis of structural failure.
Keep this job on your maintenance schedule
Save the topic as a maintenance task, choose a due date or engine-hour target, and record future service. Free and stored on your device.
Add to my maintenance plannerThis guide is for general education. Follow your equipment manufacturer’s instructions, current navigation guidance and applicable marine safety standards. When uncertain, use a qualified marine professional.