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A man in work overalls using a tribune mop to clean up the corners of a ceiling with freshly smooth and dried drywall.

Common Drywall Finishing Mistakes and How to Fix Them

Achieving smooth, flawless walls starts with proper drywall finishing, a critical step in any construction or renovation project. However, even the most experienced professionals can run into challenges during the process.

This guide explores some of the most common drywall finishing mistakes and offers practical solutions to help you deliver polished, professional results every time. 

Too Much or Too Little Joint Compound 

Problem: Using the right amount of joint compound can be tricky. Applying too much can lead to uneven surfaces, excessive sanding, and a messier workspace, while too little compound won’t adequately cover seams or create a smooth finish. Often, this mistake stems from inexperience or rushing through the process without properly assessing the surface requirements.

Solution: Start by using a manageable amount of joint compound and spreading it evenly across the joints with a drywall knife. Apply thin layers and build them gradually, allowing each layer to dry before adding more. This method ensures a smoother, more controlled application. If you’ve added too much compound, don’t worry—once it’s dry, carefully sand it down and refine the surface. For insufficient compound, you can always add another coat to fill in gaps and achieve a seamless appearance.

Visible Tape on Seams

Problem: Seeing tape through the finished surface is a common issue caused by not embedding the tape properly into the joint compound. It can also result from applying too little compound over the tape, leading to poor coverage.

Solution: When embedding the tape, it’s crucial to lay it onto fresh joint compound and gently press it into place using a drywall knife. Ensure the tape is fully flush with the surface, with no gaps or air pockets underneath. Afterward, gradually add thin coats of compound over the tape, feathering the edges outward to blend it seamlessly with the wall. This layered approach will hide the tape effectively while creating a smooth finish.

A dynamic shot of a worker in grey overalls and t-shirt using a sanding pole to smooth fresh drywall.

Uneven Sanding

Problem: Uneven sanding often occurs when too much focus is placed on one spot or when you use the improper tools, leading to gouges or inconsistencies in the surface. Over-sanding can also ruin the work, exposing tape or leaving areas too thin.

Solution: To achieve a smooth and flawless surface, use a fine-grit sanding sponge or a pole sander for even and consistent results. Start by sanding lightly, applying gentle pressure as you work. Use a circular motion or a back-and-forth technique to ensure uniformity across the surface. Be thorough but careful not to oversand, especially around edges or seams, as this can create uneven patches that will be noticeable after painting.

Take the time to check your progress frequently. Run your hand over the sanded area to feel for any bumps, ridges, or inconsistencies. Additionally, use a bright light or flashlight at an angle to identify high or low points that may need more attention. This step is crucial for ensuring the surface is perfectly smooth and ready for the next stage of your project.

Bubbles in the Tape

Problem: Bubbles occur when you don’t properly apply the tape, and usually form due to air pockets trapped underneath or insufficient joint compound beneath the tape. This issue can also arise when using too much or too little compound during installation.

Solution: If you notice bubbles while the compound is still wet, immediately press them out with a drywall knife, reapplying compound if necessary. For bubbles in dried tape, you’ll need to carefully cut out the affected area using a sharp utility knife. Once the damaged section is removed, you’ll need to re-tape the area to ensure a smooth, professional finish.

When re-taping, it’s crucial to begin by applying a smooth, even layer of joint compound underneath the tape. This step creates a strong bond and a flat surface, which helps prevent bubbles from forming in the future. After applying the tape, press it down firmly into the compound, ensuring there are no air pockets. Once the tape is secure, apply additional coats of joint compound on top, feathering out the edges for a seamless blend into the surrounding surface.

Cracking in the Joint Compound

Problem: Cracks in the joint compound often result from applying layers that are too thick, failing to allow adequate drying time between coats, or using low-quality materials that shrink as they dry. These cracks can weaken the overall integrity of the finish if not addressed.

Solution: To avoid cracking, always apply joint compound in thin, even layers and allow each coat to dry completely before adding the next. Investing in a high-quality, all-purpose compound can also reduce the risk of cracking due to shrinkage. If cracks have already appeared, you’ll need to scrape away the damaged compound, reapply a thinner layer, and sand the area smooth. Addressing the problem promptly ensures a more durable, long-lasting finish.

A focus shot of a hand wearing a red work glove, using a large taping knife to smooth out drywall mud.

Poor Feathering Edges

Problem: Feathering refers to the technique of blending the edges of the joint compound smoothly into the wall surface, creating an even, gradual transition. Poor feathering often occurs when too much compound is applied in one area, or when tools are not used properly, leading to visible ridges and uneven layers. This can make the repaired or finished area stand out, diminishing the overall quality of the wall’s appearance.

Solution: To achieve smooth feathered edges, start by using the right tools, such as a wide taping knife or drywall blade, and ensure they are clean and free from debris. When applying joint compound, use long, even strokes and gradually taper the thickness as you move outward from the seam or repaired area. Applying multiple thin coats instead of one thick layer also helps in achieving a finer finish. Sand the edges lightly between coats to remove any ridges or bumps, and always keep an eye out for uneven areas as you work. With patience and the proper technique, you can create seamless, professional-looking results.

Drywall finishing may come with its challenges, but by understanding these common mistakes and how to avoid them, you can save time, effort, and frustration while delivering a high-quality finish.

Remember, preparation and patience are key—tackle each step methodically, and don’t hesitate to make adjustments as needed. With a bit of practice and attention to detail, you’ll become more confident in your ability to create polished surfaces that stand the test of time.

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Comments

Chris - June 9, 2025

A bit late finding this but it is simple. Scuff the area to be filled with say a scotch brite pad. I prefer red. Use topping compound with a long blade to relevel ( 2 coats is best ) sand using 220 until the edges start to break and finish with a moist grout sponge for a clean transition. Wipe down when dry then prime and paint with Same color. To blend the paint on my final coat I will use 2 rollers. One wet and one dry. Apply your paint to affected area then while still wet mist water with a spray bottle on the original dry paint and roll it out. This thins the edge of the paint just like they do for a car repair. I have done this for many of repairs with great results

Abigail Burton - March 11, 2024

What if over sanded drywall was then painted?

The wall was built from new. The over sanding occurred while trying to smooth the joins. However it wasn’t noticed until after the painting was complete.

So the oversanded plaster now has undercoat and two coats of wall paint on it.

What do you think can be done?

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