Epoxy floor coating blisters

A practical decision sequence

Diagnose the cause, then verify the repair.

Use the site evidence to agree a project-specific method with the responsible engineer, concrete producer, manufacturer or specialist applicator.

01 / Symptom

What is happening?

Raised bubbles appear after coating cures.

02 / Inspect and test

Evidence to collect

Measure substrate moisture and vapour transmission as specified; inspect primer, contamination and dew point.

03 / Likely mechanism

Why it can fail

Moisture pressure, trapped air or application on unsuitable concrete can blister coating.

04 / Technical response

Choose the system

Remove failed areas and design a moisture-compatible floor system after testing.

05 / Site execution

Control the application

Prepare surface profile and moisture condition to product requirements; apply within temperature window.

06 / Acceptance

Verify the result

Check adhesion, cure and appearance before service.

Avoid this shortcut

Do not overcoat active blisters or ignore moisture in a slab-on-grade.

These guides are editorial starting points, not a project specification. Confirm the design, product data, substrate conditions and inspection plan for the actual site.

Technical references

References inform the topic; they do not endorse a specific product for this project.