Why is your drywall mud bubbling up? (2022)

Drywall mud blisters are not only unsightly and annoying, they often seem impossible to avoid. If you're a skilled tradesman or someone doing DIY jobs around your house over the weekend, you might be wondering, "why does my drywall mud have air bubbles?"

Drywall mud bubbles when applied to a painted drywall surface. As the painted surface is sealed, bubbles in the drywall mud escape through the surface of the mud. To prevent air bubbles from forming, mix drywall mud properly, use only fresh drywall mud, and apply properly.

Keep reading to learn more about why your drywall is bubbling and how you can prevent it from happening.

Is there a difference between drywall mud and regular compound?

Let's start by clearing up a common question for anyone who may be new to drywall installation: Is there a difference between drywall mud and joint compound? The answer is no. They are just different names for the same thing. If you read anything online that talks about joint compounds, know that they are referring to drywall mud.

Why does my drywall mud have air bubbles?

If you ask yourself this question, you are not alone. It's a common problem when installing drywall, but knowing the causes of why drywall mud has air bubbles will help you understand the solutions.

Drywall mud bubbling will only occur when the mud is applied to a surface that has already been painted. Unpainted drywall is porous and will allow any of the air bubbles in the drywall mud to escape through the paper and back into the rock. However, a painted drywall will not do this and any bubbles in the drywall mud will escape through the surface.


When applying drywall mud to a previously painted surface, using too thick a coat or not scraping properly can also add air to the drywall mud and cause blistering.

If you mix the drywall mud incorrectly, it can also cause blistering because over-mixing can add air pockets.

One final reason why drywall mud can bubble up is that you haven't properly prepared the surface you're applying it to. You want to make sure you clean all the dust off the drywall first, because any debris can get trapped under the mud and cause unsightly blisters.

How do you prevent blisters in drywall mud?

Fortunately, there is a wide range of solutions to help you avoid pesky mud blisters in drywall. Differentsolutionsit can work for different installation jobs, so if any of the tips in this article don't work for you, keep trying until you find the perfect solution.

How drywall mud issues mix

When it comes to bubbles in drywall mud, you can often solve the problem simply by changing the way you mix your drywall mud.

If you are using a quick drying mud make sure you only mix small batches at a time otherwise it will dry out too quickly and it will be impossible to use it properly. There are some slower drying alternatives that you can consider if you find that you constantly have to deal with this problem.

(Video) Air bubbles in drywall mud and how to solve the problem

You also need to make sure not to over mix the mud as this can trap air within the mixture which will cause it to bubble when applied. When using a drill to mix drywall mud, do not run it at too high a speed as this will add too much air to the mix.

Also, don't use the soaking action when mixing the mud, as this will also suck in the air. The best way to mix drywall mud with a drill is to do it at moderate speed and keep the putty knife in the mix until you're done mixing.

Another thing to consider is using adifferent types of slats for drywall🇧🇷 Many in the business recommend mixing drywall mud with powder rather than relying on pre-mixed mud. Mixing it yourself means you have more control over the consistency and can avoid the premix problem of taking forever to dry due to its additives.

You can also do things to change the consistency of the drywall mud so it's less likely to bubble up. A thinner layer is much less likely to form bubbles as it becomes smoother, and air bubbles are easy to expel during application. You can thin drywall mud by adding a little water to it, but make sure you don't add too much as too thin drywall mud is also useless.

Make sure your products are of good quality

Sometimes the problem that causes drywall mud to bubble is the products you are using. Be sure to only use fresh drywall mud, as improper prep can cause blistering. Same goes for a bad batch of finishers.

It's easy to test if the drywall mud is of good quality: just scrape a small piece of drywall mud onto a clean area of ​​the wall and try to scrape it off. If it doesn't budge, you know you have good drywall mud.


Also, try to avoid using drywall mud that has been sitting around for a long time. The older he is, the more problems you will have with him. There may be air bubbles in the mud, or it may no longer stick to the wall as easily.

Change the way you apply drywall mud

Many contractors agree that the best way to prevent mud blistering on drywall is to apply it a certain way. If you're inexperienced, it's easy to make mistakes when applying drywall mud, like using too much or not scraping it off properly.

Before applying the drywall mud, bend it with the knife into the tray for a few minutes. This will remove many of the air bubbles that may have accumulated during the mixing stage.

Changing the way you apply drywall mud can also help prevent blistering. The key is to apply more pressure when scraping the mud, as this will remove any bubbles that rise to the surface.

Below is the best way to apply drywall mud:

  1. Only use a thin layer when applying it to the wall.
  2. Apply the first layer, which is the base layer.
  3. Scrape this layer firmly at a 45 degree angle.
  4. Apply the second coat to hide the joint.
  5. Wait a few moments to see if bubbles form; then scrape that layer off firmly at a 45-degree angle.
  6. Apply the third coat to ensure there are no bubbles on the surface.
  7. Lixe a lama do drywall.
  8. Apply a final, well-scraped coat.

Can you use detergent on my drywall mud?

This is a common solution when looking for an answer to "why does my drywall mud have air bubbles?" Consensus on whether or not it's okay to add detergent to drywall mud is pretty divided.

(Video) Easy fix! Air bubbles in drywall mud over painted surfaces! Subscribe for more pro tips!

Many swear by it, saying that not only does it make drywall mud "creamier" and easier to apply, it also makes the tools much easier to clean in the end.

On the other hand, some say it's a bad idea, it will likely cause problems with drywall mud not sticking properly to surfaces and peeling off later.

In short, the answer seems to be that it's a personal choice, but if you use it, only put in a very small amount.

Why does the drywall fit stick?

One thing that is just as annoying as drywall mud blisters is drywall tape blisters. Most of the time, this happens due to mistakes caused by inexperience, so it's important to understand exactly what you're doing before applying the tape.

ONECommon senseDrywall tape can blister if too much drywall mud has been scraped off under the tape. Pressing too hard with the knife will cause this and not only will it cause the mud on the drywall to bubble up, it also means the paper tape will not adhere properly to the wall and could come apart later.

If you encounter this problem, it's best to remove the tape and start over. You can delete just the affected section or, if the problem affects all tapes, simply start over.

(Video) How To Fix Messed Up Drywall Work! Bubbles And Craters! DIY

Otherproblemcaused by pressing the drywall tape too hard with the knife you are drilling through it which can also cause blisters. This blistering occurs because the tape absorbs moisture from the drywall mud after the second coat is applied.

Last words

Drywall slime bubbling is annoying, but it's an easy problem to avoid as long as you understand why the bubbling occurs in the first place. Always make sure you prepare your drywall mud correctly, using only good quality products. Then, when applying the plaster putty, the secret is to use thin coats and scrape well.



Why does drywall mud bubble up? ›

What Causes Bubbles in Drywall Mud? AsktheBuilder says that the bubbles or blisters in drywall from under paper drywall tape. This happens because too much joint compound was scraped from under that tape. More specifically, there is a lack of joint compound between the tape and the surface of the drywall.

How do you keep drywall mud from bubbling? ›

To fix air bubbles in drywall mud, you will need to apply three coats of drywall mud. The first coat should be applied and immediately skimmed very firm and tightly to create a base. The second coat will fill and hide your joint. The third coat will ensure no bubbles can rise to the surface.

Why does drywall mud bubble on paint? ›

We believe that the blisters are formed with air that escapes from tiny fissures or cracks in the skim coated wall below the layers of applied paint. Under low humidity drying conditions, drywall mud and skim coat will shrink to such an extent that tiny cracks will form on the surface.

Why is my wall bubbling when applying? ›

Paint Bubbling & Blistering

Paint blisters or bubbles occur when the paint film lifts from the underlying surface. The loss of adhesion between the paint film and surface is usually caused by heat, moisture or a combination of both. This condition eventually leads to peeling.

How do you fix water bubbles in drywall? ›

To get rid of bubbles safely, remove the paint in the affected area but no more of the surrounding paint, rub the area beneath with sandpaper to make sure it's smooth, and apply joint compound to repair the wall.

How do you fix a bubbling wall? ›

Bubbles are usually localized in one spot, so you only need to remove the blistering area and not any of the rest of the paint. Rub the area underneath the bubble with sandpaper to smooth the surface. If the resulting surface is pitted or uneven, apply joint compound to repair the wall.

Why do you put dish soap in drywall mud? ›

Dish detergent makes the mud go on really smooth - it acts a s a surfactant. This trick is usually employed by folks who will NOT be painting the finished walls as sometimes the addition of dish detergent causes paint adhesion problems.

How do you fix bubbling paint on drywall? ›

Remove blisters by scraping, sanding or pressure-washing down to underlying coats of paint or primer. Repaint the surface with a high-quality interior/exterior paint (make sure the surface temperature is below 90º F).

How do you fix bubbles in drywall after painting? ›

Repairing Bubbled Paint

First, scrape away the bumps or cracks with a putty knife. Then fill any holes or cracks in the surface with a patching compound. Once the compound is dry (usually overnight), lightly sand with a fine-grit sandpaper.

Does bubbling paint mean damp? ›

Bubbling or peeling paint

This causes paint to bubble or flake. In modern homes, bubbling or peeling paint caused by damp is especially common in steamy areas with poor ventilation such as kitchens or bathrooms.

How do you know if you have moisture in your walls? ›

Here are a few common signs that you have too much moisture in your home:
  1. Peeling paint or wallpaper.
  2. Water marks or staining.
  3. Wet spots on the wall or ceiling after rain.
  4. Water running down inside walls.
  5. Walls that feel damp to the touch.
  6. Visible mold.
  7. A musty, stale odor.

How can you tell if drywall has water damage? ›

If you observe any of these signs of water damage in your home, you should call your water restoration company as soon as possible.
  1. Stains on the Walls and Ceilings. ...
  2. Flaking or Peeling Paint. ...
  3. Soft or Swollen Drywall. ...
  4. Warped Walls. ...
  5. A Strange or Musty Smell in the House. ...
  6. Mold on Your Baseboards and Walls.
4 Jul 2020

Do you need 3 coats of drywall mud? ›

If your wall has distinct crevices, cracks, or textured areas, or if your brand of drywall mud isn't offering enough coverage, you may have to do a couple of additional coats of compound. However, in general, you'll need one coat to fill in the seams and three more coats after taping.

Should I add water to my drywall mud? ›

Do I need to add water when mixing Sheetrock® Brand UltraLightweight All Purpose Joint Compound? No, Sheetrock® Brand UltraLightweight All Purpose Joint Compound is formulated as a ready-to-use product. Simply mix and use. If adding water, use sparingly and test apply.

What is the difference between sheetrock mud and joint compound? ›

Joint compound is the same as drywall mud or just mud. It's comprised mainly of gypsum and limestone, but it also has other materials such as clay, mica, perlite, and starch. Joint compound has a spreadable consistency similar to mud, which is how it got its common name.

Should you pop wall bubbles? ›

The best preventative measure is pop the bubble. This will get the water away from the drywall and lessen the amount of overall interior damage to your house. All you need is something to catch the water and something sharp to pierce the layer of paint.

Should you pop a water bubble in wall? ›

The best preventative measure is pop the bubble. This will get the water away from the drywall and lessen the amount of overall interior damage to your house. All you need is something to catch the water and something sharp to pierce the layer of paint.


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