What You Need
You don't need much, but the right tools save real time:
A bucket of premixed all-purpose joint compound (a 4.5 gallon bucket runs around $18 at Home Depot as of early 2026). A drill with a mud mixing paddle attachment. The paddle costs about $12 and is the single best $12 I've spent on drywall tools. Clean water in a smaller container you can pour from. A 6-inch taping knife or margin trowel for testing consistency.
Skip mixing with a stick or knife. I tried this for too long and it never produces an even result. The drill paddle takes about 90 seconds and the mud is uniform from top to bottom of the bucket.
Step 1: Open the Bucket Properly
The first time you open a bucket of joint compound, water has separated to the surface. Don't pour it off. That water is supposed to be there, and pouring it off will leave you with mud that's too thick.
Pry the lid off carefully. The seal is tight, especially on a fresh bucket. I use the back of a hammer to lift one corner, then work around the edge. Forcing it in one spot is how you crack lids and end up with a bucket that won't seal properly for storage.
Once it's open, you'll see standing water on top of stiff-looking mud. That's normal. The mixing process will incorporate that water back into the body of the compound.
Step 2: Initial Mix
Set the drill speed to medium-low. High speed throws mud out of the bucket and can introduce air bubbles, which create pinholes in your finished surface. Lower the paddle into the mud, push it down to the bottom, and start mixing.
Move the paddle in a slow figure-eight pattern. Pull up to the top, push down to the bottom, work around the sides. The goal is to get the standing water mixed back in and the mud uniform from top to bottom.
This first mix should take about 60 to 90 seconds. The mud will look smoother and slightly looser than when you opened the bucket. Stop and check it.
Step 3: Test the Consistency
Pull a knife full of mud out and hold the knife horizontally. Watch what happens.
If the mud holds its shape on the knife without drooping, it's still too thick for most work. If it slides off the knife immediately, it's too thin. The right starting consistency for general purpose work holds the shape for a moment, then begins to soften and droop slightly.
Another test I learned from Frank: lift the paddle out of the bucket. The mud should form a soft peak that holds for a second or two, then slumps. If it stands up straight and holds, it's too thick. If it can't even form a peak, it's too thin.
Step 4: Adjust With Water
Add water in small amounts. I'm talking maybe two tablespoons at a time for a full bucket. Pour it in, mix for 30 seconds, test again. It's much easier to add more water than to fix mud that's gone too thin.
Mud that's too thin runs off the knife, drips during application, and shrinks dramatically when it dries. You can fix thin mud by leaving the bucket open for a few hours so some water evaporates, but that's a hassle and the result is never as good as mixing it correctly the first time.
For my standard all-purpose mixing, a fresh bucket usually takes about a quarter cup of additional water to reach the consistency I want. Some brands need more, some less. The first bucket of any new brand is always experimentation.
Different Consistencies for Different Jobs
One mix doesn't fit every stage of the work. Here's what I aim for at each step:
Bedding tape: Slightly thicker than peanut butter. Stiff enough to hold the tape against the wall under pressure, soft enough that you can squeeze excess out from under the tape with your knife. If it's too thin here, the tape slides around and you can't get a clean embed.
Second coat over tape: Slightly thinner than the bedding mix. You want it to feather out without dragging. The goal is to fill the depression around the tape and bring everything to a smooth transition.
Third coat or skim coat: Thinner still. About the consistency of soft yogurt. This is what produces those wide, feathered transitions that disappear into the wall. If your skim coat mud is too stiff, you'll see knife marks and ridges that won't sand out.
Topping for final smoothing: Thinner than yogurt, almost like thick cream. At this stage you're applying a film, not building anything up.
Common Mixing Mistakes
I made every one of these at least once. Save yourself the trouble.
Mixing too aggressively. High drill speed introduces air bubbles. When you spread bubble-filled mud, those bubbles pop on the wall and leave pinholes. You'll find them later when you sand. Mix at medium-low speed.
Using cold water. Cold water from a winter tap takes longer to incorporate and can leave clumps. Room temperature water mixes in faster. The U.S. Gypsum Association notes in their technical guides that compound performance is affected by both ambient and water temperature, especially below 55 degrees Fahrenheit.
Mixing the whole bucket when you only need a pan worth. Once mixed, joint compound starts to dry slightly faster than unmixed compound. If you only need enough for one wall patch, scoop some into a separate container and mix that with a small amount of water instead of mixing the entire bucket.
Storing without sealing properly. If you mix more than you'll use that day, smooth the surface flat and pour a thin layer of water over the top before sealing the lid. This water layer prevents a dry skin from forming.
When to Replace the Bucket
Joint compound has a shelf life. The bucket might say nine months unopened. Once opened, you have maybe two months if you store it correctly, less if you don't.
Signs that mud is past its prime: a strong sour smell when you open the lid, gray or pink discoloration on the surface, lumps that won't mix in even with the paddle. Old mud loses adhesion strength and shrinks more than fresh mud during drying.
I've used mud that smelled slightly off and the work suffered. Tape didn't bond as well. Seams cracked within a few months. The $18 you save by stretching old mud isn't worth redoing the work.
For long-term storage of opened mud, the water layer trick I mentioned works for several months. But honestly, if I haven't used a bucket in two months, I usually start over with fresh material for any project that matters.