{"id":702,"date":"2026-09-25T17:30:16","date_gmt":"2026-09-25T12:00:16","guid":{"rendered":"https:\/\/www.turboluxpaints.com\/blog\/?p=702"},"modified":"2026-09-25T17:30:16","modified_gmt":"2026-09-25T12:00:16","slug":"why-does-paint-bubble-on-walls-causes-and-fixes","status":"publish","type":"post","link":"https:\/\/www.turboluxpaints.com\/blog\/why-does-paint-bubble-on-walls-causes-and-fixes\/","title":{"rendered":"Why Does Paint Bubble on Walls? 7 Causes and How to Fix Them"},"content":{"rendered":"\n
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<\/span> TROUBLESHOOTING<\/span>

Paint bubbles on walls when the film loses its grip on the surface underneath. In most Kerala homes the cause is moisture, but there are seven common culprits.<\/p>

September 2026<\/span>•<\/span>6 min read<\/span>•<\/span>By The Turbolux Team<\/span><\/div><\/div>\n
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Short answer:<\/strong> Paint bubbles on walls when the paint film loses its grip on the surface underneath, and in most Kerala homes the cause is moisture. Water or vapour trapped behind the paint pushes the film outward and forms a blister. Other common causes are painting over uncured plaster, skipping primer, painting on a dusty or oily wall, and applying coats too thickly or in direct sun. The fix is always the same in principle: find and stop the cause, scrape back to a sound surface, let it dry fully, prime, and repaint.<\/p><\/div>\n

In this guide<\/div>
What does paint bubbling look like?<\/a>What are the 7 causes of paint bubbling?<\/a>How do you find the cause on your wall?<\/a>How do you fix bubbling paint, step by step?<\/a>How do you stop paint bubbling from coming back?<\/a>Frequently asked questions<\/a><\/div><\/div>\n

Here are the seven causes and exactly how to deal with each one.<\/p>\n\n

What does paint bubbling look like?<\/h2>\n

Bubbling, also called blistering, shows up as raised, rounded pockets in the paint film. They can be as small as a pea or as large as your palm. Press one and it may feel soft, crunch, or release water. Bubbles are different from peeling, where the paint lifts in flakes, and from cracking, where fine lines appear. That said, bubbles left alone usually burst and turn into peeling.<\/p>\n\n

What are the 7 causes of paint bubbling?<\/h2>\n\n

1. Dampness in the wall<\/h3>\n

This is the number one cause in Kerala. Rainwater entering through exterior walls, rising damp from the foundation, or leaking pipes inside the wall all push moisture toward the painted surface. When the moisture tries to escape, it lifts the paint. Bubbles that appear low on the wall, near bathrooms, or after heavy rain almost always point to damp.<\/p>\n\n

2. Painting over new, uncured plaster<\/h3>\n

Fresh cement plaster holds a lot of water and needs time to cure and dry. Painting too early traps that water. As a rule, allow new plaster at least 28 days to cure before painting, longer during the monsoon.<\/p>\n\n

3. Skipping the primer<\/h3>\n

Primer seals a porous wall and gives the topcoat something to grip. Without it, the emulsion bonds unevenly and small pockets can lift, especially on putty or plaster that absorbs moisture.<\/p>\n\n\n\n

4. Dust, grease or loose old paint<\/h3>\n

Paint sticks to what’s on the surface, not the wall behind it. Dust from sanding, kitchen grease, or chalky old paint all create a weak layer that lets the new coat lift.<\/p>\n\n

5. Painting in direct sun or on a hot wall<\/h3>\n

On exterior walls, strong afternoon sun dries the top of the paint film before the layer underneath has released its moisture. The trapped solvent or water vapour forms small bubbles, often within hours of painting.<\/p>\n\n

6. Coats that are too thick, or recoated too soon<\/h3>\n

A heavy coat dries on the surface first and traps moisture below. Applying the second coat before the first is dry does the same. Follow the recoat time on the pack, typically several hours for water-based emulsions and longer in humid weather.<\/p>\n\n

7. Incompatible paint layers<\/h3>\n

Applying water-based emulsion directly over old oil-based enamel without proper sanding and priming often ends in poor adhesion and bubbling.<\/p>\n\n

How do you find the cause on your wall?<\/h2>\n
What you see<\/th>Most likely cause<\/th>What to do first<\/th><\/tr><\/thead>
Bubbles with water inside, near the floor or bathroom<\/td>Rising damp or plumbing leak<\/td>Check pipes, fix the leak, treat for damp<\/td><\/tr>
Bubbles that appear after heavy rain on an outer wall<\/td>Water seepage through the exterior<\/td>Seal cracks and waterproof the exterior<\/td><\/tr>
White powder under the bubble<\/td>Efflorescence (salts carried by moisture)<\/td>Stop the moisture, brush off salts, then prime<\/td><\/tr>
Many small bubbles within hours of painting<\/td>Heat, direct sun or a thick coat<\/td>Sand smooth and repaint in the shade<\/td><\/tr>
Dry bubbles across a new wall<\/td>Uncured plaster or no primer<\/td>Let the wall dry, then prime before repainting<\/td><\/tr><\/tbody><\/table><\/div>\n

A simple test for damp: tape a 30 cm square of clear plastic sheet tightly to the wall and leave it for 24 hours. If droplets form under the plastic, moisture is coming from inside the wall.<\/p>\n\n

How do you fix bubbling paint, step by step?<\/h2>\n
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  1. Stop the moisture source.<\/strong> Repair leaking pipes, seal cracks, fix roof or terrace leaks, and correct any drainage near the wall. Repainting before this step simply wastes paint.<\/li>\n
  2. Scrape off every bubble.<\/strong> Use a scraper to remove all blistered and loose paint until you reach paint that’s firmly bonded.<\/li>\n
  3. Sand the edges.<\/strong> Feather the edges of the scraped area with 120 to 180 grit sandpaper so the repair doesn’t show.<\/li>\n
  4. Let the wall dry completely.<\/strong> This can take several days, longer in the monsoon. A moisture meter reading helps, and your painter or dealer can check it.<\/li>\n
  5. Treat the damp area.<\/strong> On walls with a history of damp, apply a damp-proof coating before primer.<\/li>\n
  6. Fill and level.<\/strong> Fill any dents with putty and sand smooth once dry.<\/li>\n
  7. Prime.<\/strong> Apply one coat of a suitable primer to seal the repaired area.<\/li>\n
  8. Repaint in thin, even coats.<\/strong> Apply two coats of emulsion, respecting the recoat time, and avoid painting exterior walls in strong midday sun.<\/li>\n<\/ol>\n\n
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    How do you stop paint bubbling from coming back?<\/h2>\n