what causes spray paint to bubble

What Causes Spray Paint to Bubble? [Steps To Fix It]

Spray paint is an excellent medium for giving your product a sleek appearance. However, it’s not as easy as just grabbing a can, shaking it, and spraying the desired spot. If you want to be sure that the paint produces a smooth, even surface and doesn’t bubble or warp, you must do more than that. If you’re wondering “what causes spray paint to bubble” or “why is my spray paint bubbling,” read on. You are not by yourself.

What Causes Spray Paint to Bubble?

If your spray paint is bubbling, you probably made a mistake either during the application process or during the surface preparation. Unfortunately, there are a lot of possibilities, so reducing the field may require some time and work.

When a layer of paint is applied too thickly or is exposed to unfavorable circumstances, blisters in spray paint develop. Before the volatile solvents beneath can evaporate, the paint’s top layer dries. Under the dry layer of paint, the ongoing evaporation results in the accumulation of blisters or air bubbles.

We have a few ideas for what might be causing the bubbles in your spray paint.

Outside, It Might be too Soggy

In this situation, the initial coat of paint needs more time to cure. Therefore, if you apply a second coat before the first has had a chance to dry, it will expand. The moisture in your basement is typical of other places, whether or not you are spraying indoors.

There are Really Cold Temperatures Here

When working with metallic surfaces, it’s essential to make sure that the outside temperature is between 50 and 90 °F. Keep in mind, though, that metal will stay colder for longer than, for example, rattan or wood! It might therefore be required for it to be warmer or to have more sunlight.

Another Consideration is the Oppressive Outdoor Temperature

Even though there aren’t many accounts of it happening, you might have heard that a few of your neighbors or friends were impacted. Spray painting should therefore be avoided during the hottest summer months.

The Dry Period Adds Another Justification for the Bubbles

If consumers don’t let the initial coat of paint dry naturally, bubbles are more likely to start to appear when the top coat of paint is applied. When painting something, keep in mind that a clean, dry object is necessary for a fantastic, smooth finish.

How Can I Address the Paint-bubbling Problem?

You must first deal with the underlying problems if you want to avoid another bubbling paint job in the future.

Clean surfaces with a sponge and soapy water, then wipe them dry completely. To conceal stains or prepare porous materials like fresh drywall or plaster, use an appropriate primer. Additionally, make sure the temperature is within the paint manufacturer’s recommended range of 50 to 85 degrees F.

Poor paint adhesion and bubbling might result from using the incorrect roller material or nap length for the sort of surface you’re working on. For smooth or rather smooth surfaces, use a foam or short nap roller cover; for somewhat rougher surfaces, a medium or long nap roller cover; and for exceptionally rough surfaces, a long nap roller cover.

After you’ve identified and resolved the issue that caused your paint to cling partially to the substrate, you can proceed to repair the bubbled or blistered regions.

Can Blown-up Paint be Repaired?

Painters frequently worry about having to repaint due to spray paint bubbling. However, there are other approaches to fixing it. Fixing bubbled paint is possible. Usually, you should let it dry if bubbles pop soon. Once more, if bubbles appear after applying a second coat, they will disappear on their own.

If you see that the bubbles are still the same as before, you must do some difficult actions.

How Can Paint that is Bubbling Be Fixed?

Eliminate the Tarnished Paint

Long vertical and horizontal strokes with a putty knife are used to gently scrape away paint that has risen from the surface.

Clean Up the Area

Fill any holes or indentations in the substrate with a thin coating of a patching compound using a clean putty knife. Let the compound dry completely before using fine-grit sandpaper to smooth up the mended areas. Apply a suitable primer if necessary after cleaning and drying the surface.


Use the appropriate brush or roller to repaint the surface when the primer coat has fully dried. To prevent bubbles from forming, stir the paint carefully. Roll or brush the paint at a reasonable pace.

Is it Possible to Sand Bubbling Paint?

Simply lightly smooth the surface of the spray-painted area if bubbling has already become an issue. It is advised to use 220 grit sandpaper for the process. After wiping the area with a dry, clean towel, add another coat of spray paint.

Can I Blow the Paint Bubbles Up?

Bubble-popping with paint is not advised. Continue attempting to scrape the bubble area with a putty knife whenever you spot any paint bubbles. If your paint isn’t dry and the bubbles start to grow, you don’t need to pop them; just wait for it to dry. They’ll travel independently.

What Should you do to Prevent Spray Paint Bubbles?

Of course, one should be aware of the basic methods for mending the bubbling spray paint cover. But let’s all agree that it is far better to be ready and steer clear of that issue completely.

  • Spray painting is suggested when the ambient temperature is between 50 and 90 degrees Fahrenheit, and the relative humidity is less than 85%.
  • Another suggestion is to paint in multiple light coats.
  • Spray a pattern on your item, beginning and ending there.
  • After each pass is finished, take out the spray button.
  • Movement from side to side ought to be uniform.
  • Your spray paint design should overlap by about a third.
  • This makes it simple to maintain a surface free of bubbles.

What’s the Source of the Bubbles and Fractures in My Spray Paint?

Because the spray paint’s core layer has moisture and the outside layer has dried more quickly than the inner layer, the spray paint begins to pop and split.

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