How to fix bubbling paint and prevent it from happening again

Painting is a fun and artistic project that often requires careful attention to detail. Imagine spending countless hours dusting, spackling, sanding, washing the walls before painting, taping, and then finally layering on those glorious coats – only to find that the final result isn’t as flawless as you had originally hoped. The paint is no longer smooth — instead, it’s horribly bubbled. Unfortunately, bubbles in paint can unexpectedly develop even after a paint job is completed. The good news is that steps can be taken to prevent this problem from happening.

two people painting an interior wall
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What causes paint to bubble?

Hunker states, “Paint bubbling is caused by the paint film lifting away from the surface.” Although there are several reasons why paint can bubble, let’s take a look at the two most common reasons. We’ll also cover how to fix and prevent these issues.

Primer was skipped

Not all substrates are infused with primer. Plaster and bare drywall are porous and can absorb a great amount of the pigments and binders (resins) that are found in paint. The paint’s base coat will typically contain a binder film that’s much thinner, which means that the next coat of paint won’t have the means to stick to the coat of paint that came before it. In general, never skip the primer if the paint being used isn’t already sealed with it.

Fix it–Luckily, there is a solution if the paint is forming bubbles after a primer-free application. Before making the move to repaint the surface, begin to scrape away the bubbles, and patch it along the way. Scrape, clean the surface, and finish off with latex and oil-based primer that works to block any stains. Also, choose the primer according to the type of paint being used. For the next paint application, don’t skip out on the primer. For more information, check out our tips on sanding and priming.

The painting surface is wet

There may be moisture settling. Excess moisture on painted walls can lead to water-filled bubbles in the paint. Moisture can come from intense humidity, droplets of water, water leaks, or plumbing issues. Unfortunately, water-filled bubbles may be on the substrate level, deeper in the paint, or in the top coat. It’s common to find this type of bubbling in kitchens, bathrooms, and basements due to excess condensation and moisture in those rooms. Also, improper ventilation makes paint bubbles more likely to occur.

Fix it–Before putting in the effort to scrape off and patch these paint bubbles, be sure to address and investigate the moisture’s source. Moisture can come from anywhere, such as flooding, bathroom humidity, plumbing problems, roof leaks, and more. Once the source has been cleared, begin to scrape, patch up, and clean, then let the walls dry.

person's hand with paint roller and yellow paint on wall

Remember, it’s important to minimize moisture possibilities so they don’t negatively impact the paint job. Bob Vila offers advice on this particular subject. By addressing and fixing the moisture source, paint bubbles can be properly handled and prevented in the future.

There is more to painting than just swiping paint around walls and floors — it requires careful consideration. Understanding what causes paint to bubble and how to fix painting mistakes on walls can dramatically reduce terrible paint bubbles from forming and ruining your work. A proper and careful paint application calls for a flawless finish. Also, if you’re interested in painting your home’s interior, but don’t know which color suits best with your space, take a look at these latest wall painting trends.

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