How To Finish Drywall

Learning how to finish drywall takes patience and control, not just the right tools. The goal is to make seams, fasteners, and joints disappear so the surface looks continuous once painted. This process involves applying joint compound, embedding tape, and sanding in stages to build a smooth, even finish. While the steps are straightforward, the difference between an average result and a professional one comes down to technique and consistency.

Our guide explains the process step by step and features techniques and advice from This Old House Magazine and drywall contractor Paul Landry.

Drywall Finishing Basics

Drywall finishing is the process of concealing seams, fasteners, and joints so the surface appears uniform under paint or texture. The goal isn’t just to cover these areas, but to create smooth transitions that won’t show once the wall is finished.

The key skills are properly embedding tape and feathering compound so edges blend seamlessly into the surrounding surface. Small inconsistencies at this stage often become more visible after painting, especially in rooms with strong natural or angled light.

Essential Tools and Materials for Drywall Finishing

The right tools make a noticeable difference in how smoothly compound applies and how much sanding is required later. Using the correct knife size and compound type can help reduce ridges and improve the final finish.

Drywall Knives and Taping Tools

The primary tools for finishing drywall are putty knives. You’ll need at least two sizes: a 5-inch knife for taping and a 10-inch knife for feathering and applying wider coats. Wider knives help spread the compound more evenly, reducing buildup and minimizing sanding later. A taping knife or banjo can also speed up the taping process on larger jobs.

Joint Compound and Tape

Joint compound, or “mud,” is used to fill seams and cover fasteners. For most projects, a premixed all-purpose compound works well and is easy to handle. You’ll also need drywall tape, available in paper or mesh. Paper tape is generally preferred because it’s stronger and creates a smoother, more consistent finish, especially on flat seams.

Drywall Sanding Equipment

A swivel-head pole sander works well for large surfaces, while a sanding block is better for corners and tight areas. Start with medium-grit sandpaper and move to finer grits for final smoothing. Always wear a dust mask and safety glasses to protect against fine drywall dust.

Preparing the Work Area to Finish Drywall

Drywall finishing can get messy quickly, so preparing your workspace ahead of time helps keep the process efficient and reduces cleanup later.

Cleaning and Inspecting Drywall Surfaces

Start by thoroughly inspecting the hung drywall. Look for any screwheads poking above the surface and drive them in until they’re slightly recessed. Remove any loose or torn paper, especially from corners and cut edges. This prevents debris from getting trapped in the compound and creating bumps in the finish.

Before you begin, use a bright light held at a shallow angle against the wall to highlight imperfections such as raised screwheads or surface damage that are easy to miss under normal lighting. As noted in This Old House Magazine, this simple step can help you catch issues early and avoid rework later.

Setting Up Your Workspace

Organize your tools and materials so everything is within easy reach. If you’re finishing a ceiling, set up a stable work platform.

Before starting, mix the joint compound thoroughly and remove any dried material from the lid or edges of the bucket. As outlined in This Old House Magazine, even small, hardened bits can create ridges in the finish as you work.

Cover the floor with drop cloths to protect it from compound drips and sanding dust. Make sure the room is well ventilated and maintains a consistent temperature, which helps ensure even drying times between coats.

The Five Levels of Drywall Finishing

Drywall finishing is categorized into five levels, each representing a different degree of smoothness and preparation. Choosing the right level depends on how visible the surface will be and the type of finish you plan to apply.

• Level 0: No taping, finishing, or accessories. Used in temporary construction or when the final finish hasn’t been determined.
• Level 1: Tape embedded in compound with minimal finishing. Common in concealed areas such as above ceilings or utility spaces.
• Level 2: Adds a second coat over joints and fasteners. Suitable for garages, storage areas, or other low-visibility spaces.
• Level 3: Additional coats smooth joints and fasteners. Best for surfaces that will receive heavy texture or wall coverings.
• Level 4: Standard for most interior walls and ceilings. Provides a smooth surface for flat or low-sheen paint, though imperfections may show under strong lighting.
• Level 5: Includes a skim coat over the entire surface. Ideal for areas with bright lighting or when using glossy paint finishes.

Step-By-Step Guide To Finishing Drywall

Applying the First Coat of Joint Compound

Begin by mixing your joint compound if necessary. If there’s water on top of the premixed compound, use a mixing paddle attached to a drill to blend it until smooth.

Using a 5-inch knife, fill your mud box halfway with compound. Load the knife blade with about 2 inches of compound and start in one corner of the room. Force the compound into the joints between sheets, filling them completely, then smooth it out in a single pass, holding the knife at a consistent angle to control the amount of material left behind. Most drywall knives have a slight bow in the blade. Keeping the concave side against the wall helps spread the compound more evenly and reduces ridges in the finish.

Drywall contractor Paul Landry, owner of P. L. Drywall, explains in This Old House Magazine that the first coat isn’t the one to perfect. It’s the second and third coats that ultimately determine how smooth the finished surface will be. Fill screw holes with a quick pass of compound. This first coat is about filling joints and establishing a base, not achieving a finished surface.

Taping Drywall Seams

After applying the first coat of compound, embed the tape.

Unroll about 3 feet of tape and center it over the seam. Gently press it into the fresh compound with your fingers, then continue along the joint. Tear the tape at the end by placing the knife edge perpendicular to the tape.

To smooth the tape, start near the center of the joint and draw the knife toward one end, pressing firmly enough to embed the tape while removing excess compound. Return to the starting point and repeat in the opposite direction.

Consistent pressure is key here. Too much force can pull the tape out of place, while too little leaves excess compound behind, creating buildup that requires more sanding later.

Covering Screwheads and Corner Beads

Next, you’ll need to cover screwheads and corner beads.

For screwheads, apply a thin layer of compound over each one, ensuring they’re completely covered.

For corner beads, make sure they’re securely fastened every 10 inches. Apply compound to both sides of the bead, then smooth it out with your knife, holding the blade against the drywall and the bead simultaneously.

This process helps create crisp, clean corners that look professional when painted.

Drywall Sanding Techniques for Smooth Walls

Sanding is about refining the surface, not removing large amounts of material. The goal is to eliminate ridges and high spots while keeping the compound intact so the surface remains even.

Using a Pole Sander

A pole sander works well for large areas and helps maintain consistent pressure across the surface.

Start with medium-grit sandpaper and move to finer grits for final smoothing. Use light, even pressure and focus on blending edges rather than sanding entire sections. This helps preserve the thickness of the compound while smoothing transitions between seams and the surrounding drywall.

Hand Sanding Difficult Areas

Use a sanding block or sponge for corners, edges, and tight spots where a pole sander can’t reach.

Work carefully in these areas, especially around corners, to avoid damaging the drywall paper or exposing the tape. Instead of trying to remove all visible compound, aim to create a smooth transition between the patched area and the wall surface.

Applying Second and Third Coats to Drywall

After the first coat is dry and lightly sanded, apply additional coats to build a smooth, seamless surface.

Use a wider knife, typically 10 inches or more, to spread the compound beyond the original joint. Each coat should extend slightly farther than the last, which helps reduce visible transitions between the seam and the surrounding wall.

Feathering Techniques for Seamless Finish

Feathering is what makes drywall joints disappear. It involves applying more pressure at the center of the joint and gradually easing off as you move outward so the compound thins at the edges.

This creates a smooth transition that blends into the drywall surface without leaving ridges or buildup. Wider knives make this easier by spreading the compound more evenly and reducing the need for heavy sanding later.

Drying Time Between Coats

Allow each coat to dry completely before sanding or applying the next. While this typically takes about 24 hours, drying time can vary depending on humidity, airflow, and temperature.

Instead of relying only on time, check the surface visually. Dry compound turns uniformly white, while damp areas appear darker. Working too quickly can lead to shrinkage, cracking, or uneven surfaces that require additional repairs.

Finishing Drywall Inside and Outside Corners

Inside and outside corners require slightly different techniques, but both rely on consistent pressure and clean application to create sharp, durable edges.

Taping Inside Corners

Apply compound to both sides of the corner using a 5-inch knife.

Cut a piece of tape to length and crease it along the center. Press the tape into the corner, then start in the middle and draw the knife along one side, smoothing it while removing excess compound. Repeat on the opposite side.

Work back toward the starting point to clean up any remaining buildup. The goal is to create a crisp corner without excess compound that will require heavy sanding later.

Installing and Finishing Corner Beads

Outside corners require a corner bead to protect the edge and maintain a straight line.

Fasten the bead securely, then apply compound to both sides. Hold the knife so it contacts both the drywall and the bead, and smooth the compound in a single pass down the corner. Repeat on the opposite side.

Keep pressure consistent to avoid creating ridges along the edge. A clean, even application here reduces sanding and helps maintain a sharp corner once finished.

Pro Techniques for a Smoother Finish

Achieving a professional-looking drywall finish comes down to controlling thickness, pressure, and timing rather than applying more compound.

• Use setting-type compound (“hot mud”) for the first coat: It hardens through a chemical reaction, allowing you to apply additional coats sooner.
• Try a damp sponge for final smoothing: This reduces dust and helps blend edges without removing too much material.
• Apply thin, even coats: Building up the surface gradually minimizes sanding and helps prevent damage to the drywall paper or tape.

Priming and Painting Finished Drywall

Once the final coat is dry and sanded, remove all dust from the surface using a damp cloth or vacuum. Any remaining dust can affect how primer and paint adhere.

Apply a drywall-specific primer to seal the porous surface of the joint compound and create a uniform base. Without primer, painted areas can appear uneven due to differences in absorption between the compound and the drywall paper.

After the primer dries, the surface is ready for paint or wallpaper. A properly primed surface helps improve coverage, reduce the number of paint coats needed, and produce a more consistent finish.

Troubleshooting Drywall Finishing Issues

Even with careful work, small issues can show up during drywall finishing. Addressing them early helps prevent more noticeable flaws later.

Bubbles and Blisters

Bubbles or blisters usually form when air is trapped beneath the tape or compound. To fix them, cut out the affected area with a utility knife, then reapply fresh compound and tape. Press firmly to remove air pockets as you embed the tape. For small surface blisters, sand them down and apply a thin coat of compound to smooth the area.

Cracks and Surface Imperfections

Cracks often result from compound applied too thickly or from drying too quickly. Sand the area smooth, then apply a thin coat of compound and re-tape if necessary. For dents, gouges, or uneven spots, fill them with compound, allow them to dry completely, and sand smooth. Thin, multiple coats are more effective than a single thick application and help prevent recurring issues.

Our Conclusion

Finishing drywall is less about speed and more about control. Applying thin coats, maintaining consistent pressure, and allowing proper drying time between steps are what create a smooth, seamless surface. With practice, these techniques become more intuitive, and even challenging seams and corners can be finished to a professional standard.

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