Few things are more frustrating than finishing a paint job only to see bubbles or blisters appear on the surface. These imperfections not only ruin the finish but can also signal deeper issues with adhesion, moisture, or surface prep. Below, our experts at Randall’s explain why paint bubbles and how to fix — and prevent — it from happening again.
1. What causes paint to bubble or blister?
Paint bubbles when it loses adhesion to the surface beneath it. Common causes include:
- Moisture trapped under the paint layer
- Painting over dirty, greasy, or wet walls
- Applying paint to a hot or sunlit surface
- Skipping primer or using incompatible paint types
- Painting before the previous coat is fully dry
2. What’s the difference between bubbling and blistering?
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Bubbling happens when air or moisture gets trapped under the paint during application.
- Blistering occurs when these bubbles expand, usually due to heat or ongoing moisture problems.
Both require proper repair to prevent future peeling or cracking.
3. How can I fix paint bubbles once they’ve appeared?
Follow these steps:
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Identify the cause — moisture, heat, or poor prep.
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Scrape off the bubbled paint carefully with a putty knife.
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Sand the area smooth with fine-grit sandpaper.
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Prime the surface to seal and ensure good adhesion.
- Repaint with high-quality paint suited for your surface type.
Shop Randall’s premium primers and paints in our collections
4. How can I prevent paint from bubbling in the future?
- Always paint on clean, dry surfaces.
- Avoid painting in direct sunlight or extreme humidity.
- Allow each coat to dry completely before applying the next.
- Use primer when painting over new drywall, glossy surfaces, or repairs.
5. Does humidity affect paint adhesion?
Yes. High humidity slows drying and traps moisture under the paint film, leading to bubbling or peeling. Use a dehumidifier or fan if painting in humid conditions.
6. Can moisture inside the wall cause bubbling?
Yes, especially in bathrooms, kitchens, or exterior walls. Persistent bubbling in the same area may indicate a leak or poor ventilation that needs to be addressed before repainting.
7. What types of paint are most resistant to bubbling?
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High-quality acrylic latex paints for interiors and exteriors
- Moisture-resistant bathroom and kitchen paints
- Elastomeric paints for flexible outdoor surfaces
Randall’s experts can recommend the best paint for your project through our services
8. Should I always use primer to prevent bubbles?
Yes. Primer ensures proper adhesion and seals porous or repaired surfaces, preventing air or moisture from seeping through.
9. Can professionals fix bubbling paint more effectively?
Definitely. Professionals can identify the exact cause—whether moisture, heat, or improper prep—and repair it permanently. You can connect with trusted painters through our Painter Order Form
10. How can Randall’s help with paint bubbling issues?
Randall’s provides:
- Premium primers and paints to prevent adhesion problems
- Expert advice on humidity control and prep techniques
- Professional painting servicesfor lasting results
- Personalized support via our Contact Us
Paint bubbling or blistering is usually a sign of poor surface prep or trapped moisture, but it’s easy to fix with the right approach. Always clean, prime, and allow proper drying time before painting—and choose high-quality products that last.
Randall’s has everything you need to achieve smooth, durable finishes — from expert guidance to professional-grade materials.