Drywall Taping, Mudding, and Sanding: Step-by-Step Guide

Over the weekend we finished our drywall-hanging project in the laundry room. It was humbling, educational, and ultimately very satisfying. Sherry and I even spent a few minutes just admiring the walls on Sunday.

Julie Andrews Sound Of Music Meme Look At All Of The Walls I Made

There’s a real, tangible euphoria that comes with finishing a project. It’s silly and glorious and yes — it can make a grown person twirl.

Doing Our Research

We’re not calling ourselves professional drywall finishers yet, but we feel much more confident heading into future drywall work. We spent a morning watching YouTube tutorials and reading guides, discovering there are many approaches and opinions. We settled on a clear, commonly recommended method and followed it for our project. Below I’ll outline the steps we took and the techniques that worked best for us, and we included a couple of videos that helped along the way.

before and after of room without drywall and with finished drywall

Initially I suggested we consider hiring the taping and mudding out — it’s definitely a skill that pros make look easy. Our prior experience was limited to patching small holes and a handful of seams during our first bathroom renovation years ago. As we continued renovating on our own, though, the laundry room felt like the right place to practice drywall finishing: lots of seams to learn on, and many of them would later be obscured by trim, cabinets, appliances, and tile if they weren’t perfect.

father and son installing drywall in old house's bathroom

Materials To Tape, Mud, And Sand Drywall

Here are the materials we used — most are available in the drywall section of any home improvement store:

  • Rosin paper or other floor protection to catch drops, splatters, and dust (avoid letting joint compound dry on a subfloor or it can cause bumps).
  • Joint compound (mud) — we avoided ultra-lightweight varieties based on reviews. A rule of thumb is about 1 gallon per 100 square feet; we estimated 4 gallons but used closer to 5.
  • Mud pan for carrying compound and keeping knives clean.
  • Drywall knives in multiple sizes — we used 6″, 8″, 10″, and 12″ blades.
  • Corner trowel — extremely helpful for smoothing inside corners.
  • Drywall tape (paper tape in our case).
  • Bucket of water, work light, and a stepladder as needed.
drywall mud or sheetrock join compound with spackle knife and mud pan

The mud pan was handy for carrying a workable amount of compound without lugging the whole bucket. Its edges are also useful for scraping knives clean during the process.

joint compound in mud pan with knife

Mudding Over The Screws

We began by covering the screw heads. Because we used a drywall countersink bit, the screws were slightly recessed already, so applying mud and scraping it flat was quick and straightforward.

grid of mud being applied over screw head in drywall installation

Sherry handled two walls and the hallway while I covered the other two walls and the ceiling, which made the work go faster.

John applying mud over drywall screw head marks

Taping The Drywall Seams

Next we taped the seams. We opted for paper tape rather than adhesive mesh tape because paper tape, when bedded in mud, produced a smoother finish and didn’t reveal mesh texture after sanding.

drywall tape shown torn and ready to apply

For horizontal seams I applied a bedding layer of mud, using the tapered edges of the drywall to bridge and flatten the joint. I smoothed that initial bed with a 6″ knife before pressing a pre-cut strip of tape into the mud. I kept the tape dry (some tutorials suggest wetting it, but I found that messier).

applying thick layer of drywall mud as bed across drywall seams

After lightly seating the tape, I leveled it with the 6″ knife, working from the center toward each end. Then I used an 8″ knife to apply another layer and feather the edges, which helps blend the joint into the wall.

hand pushing drywall tape into bed of drywall mud along seam
drywall knife smoothing tape into drywall tape and bottom layer of mud
larger drywall knife being dragged across tape to apply another layer of mud

After the first round on horizontal seams, I was pleasantly surprised by how manageable it felt.

finished first layer of drywall mud over taped seam

Taping The Corners

Corners are trickier than flat seams and require more focus and time. We used pre-creased paper tape made for inside corners. The process began the same way: a bedding layer of mud on each side of the corner, followed by smoothing with a corner trowel, which is excellent for forming a clean angle.

hand folding drywall tape along seam before pressing in corner
flat drywall knife putting joint compound into corner of room
corner trowel smoothing thick first layer of drywall mud in room corner

I pressed the tape into the mud, then used the corner trowel to smooth it. When the top of the corner was hard to reach, dipping the trowel in water helped it glide without dragging the paper.

handing pressing drywall tape into corner layer of mud
corner trowel pressing tape into corner of drywalled room

We had many corners to practice on — vertical corners, ceiling corners, and doorways — which added time but also valuable experience. My first coat of mud took longer to dry than some tutorials suggested; we waited an extra day in spots that still felt damp.

small room with one coat of drywall tape and mud applied

Applying A Second Coat Of Mud

After everything dried and the mud reached a uniform color, we applied a second coat using a 10″ knife to spread and feather the edges further. We also added another pass over screw heads where the first coat had shrunk a bit.

John dragging large drywall knife over seam in drywall to smooth mud
screw head with dried joint compound over it that has shrunk slightly

Before re-taping corners, I watched a few more videos and practiced the technique that worked for me: use the corner trowel, then address the ridges it can leave with a 6″ knife held at a slight angle to feather and remove excess without creating new ridges. After that, a final pass with the corner trowel solidified a crisp, smooth corner.

John smoothing drywall mud in corner of room using corner trowel
arrow pointing to ridge in drywall mud after scraping excess
flat drywall knife dragging along outer edge of corner with pressure applied to outside of knife
dragging corner trowel down corner of drywalled wall
room with drywalled corners dried

Wet Sanding The Drywall

About 24 hours after the second coat we sanded. I wanted to reduce dust, so we tried wet sanding. A regular sponge didn’t have enough scrubbing power, so I used a 120-grit sanding block dampened with water. The block held moisture and scrubbed more effectively than a sponge.

rough edges of drywall mud dried on wall
materials for wet sanding drywall sponge sanding block bucket of warm water

The damp block picked up dust rather than sending it into the air. It wasn’t perfectly dust-free, but the dust settled below the work area instead of forming a cloud. When one side of the block filled with dust I flipped it or rinsed it in the bucket to continue.

using yellow songs to wipe rough ridge of dried drywall mud
squeezing water out of sanding block like a sponge into a bucket
rubbing wet sanding block on drywall mud to smooth
wet sanding block with wet dust coating it after drywall sanding

Wet sanding made a big difference in smoothing rough spots and blending seams.

before and after side by side of rough drywall mud sanded smooth

Applying The Third (And Final) Coat Of Mud

After sanding we applied a thin final coat. Thinning the compound slightly with water made it spread more smoothly. We mixed a small amount in a separate bucket with a paddle mixer until the consistency matched mayonnaise.

bucket of joint compound with a little bit of water in it to thin it out
mixing bucket of drywall mud joint compound with drill mixing paddle

We skipped photos of the final application and sanding since the steps mirrored earlier rounds, and there are already many pictures here. The result, though, was a clean, finished surface ready for primer.

after of room when drywall tape mud and sanding is done

Priming The Room

We primed the room to see how the finish held up under paint. The primer revealed a smooth, cohesive surface — suddenly it felt like a true room instead of a construction zone. We were excited and a little proud of what we accomplished.

room primed after drywall taping mudding and sanding is complete

Here are a few before-and-after comparisons showing the transformation in the hallway and doorway. It’s rewarding to see how a formerly unused corner now feels like a purposeful space.

before and after side by side of old laundry room and new drywalled doorway
before and after side by side of hallway with new doorway at the end

Next up: painting and installing tile flooring. After that we’ll decide whether to temporarily move the washer and dryer back in or wait until trim and doors are finished. Either way, this project taught us a lot and left the laundry room feeling like a real, usable space.