Premixed all purpose joint compound

Premixed all purpose joint compound DEFAULT
  • Works great for first phases of finishing.
  • Stays strong – highly durable surface.
  • Mold Resistant.

ProForm® All Purpose Joint Compound is a vinyl base ready mix joint compound for the professional that may be used directly from the container.

All Purpose Joint Compound is designed for tape application, fastener spotting, and complete joint finishing of gypsum board. It can also be used to repair cracks in plastered walls, to texture surfaces, and to laminate gypsum board to other surfaces such as masonry or other gypsum board. It contains enough binder to secure the reinforcing tape and develops its strength and hardness by drying.


  • Ideal for taping, filling, finishing, and texturing.
  • Ready to use right from the container.
  • Excellent adhesion/bond.
  • Low VOC content - less than 2 grams/liter.

ProForm® All Purpose Joint Compound manufactured in Belcamp has achieved GREENGUARD Gold Certification.

ProForm® All Purpose Joint Compound manufactured in Atlanta, Dallas, Jasper and Orlando has achieved GREENGUARD Certification.


Joint compound

For pipe joint compound, see Pipe dope.

Drywall with joint compound applied.

Joint compound (also known as drywall compound or Mastic) is a white powder of primarily gypsum dust mixed with water to form a mud the consistency of cake frosting, which is used with paper or fiber joint tape to seal joints between sheets of drywall to create a seamless base for paint on interior walls. It is often referred to simply as mud[1] or as joint cement.[2]

Drying type[edit]

Drying type joint compounds are vinyl based and harden when they dry by evaporation.

Ready-mix lightweight joint compound[edit]

Ready-mix lightweight joint compound is a pre-made form of joint compound designed for fast application and easy maintenance. The compound is a complex combination often including water, limestone, expanded perlite, ethylene-vinyl acetatepolymer, attapulgite, and other ingredients. The delicate mixture of compounds gives it a creamy texture that spreads easily onto drywall surfaces and then hardens as the moisture evaporates. Drying type compound takes a long time to dry out and is used to fill holes or gaps and shrinks as it drys, possibly producing cracks in thick applications. Ready-mix joint compound is usually more forgiving than the setting type of joint compound. It can be used for as long a period of time as needed, and does not dry up unless left unattended for a long period of time, but must be kept from freezing. This type of compounds should be used at temperatures above 55 °F (13 °C) and all of the materials should be a similar temperature.[1]

There are mainly three types of premixed joint compounds.

1 premixed taping compound which is using for bedding and taping coat.

2 Finishing or topping compound which is using for filling and finishing coats.

3 All purpose joint compound which can be used in bedding and taping coat, filling and finishing coats.

Powdered drying type[edit]

Powdered drying type compounds are available.

Setting type[edit]

Setting type joint compounds come in powder form and are mixed with water immediately before use. This type contains plaster of paris and sets through a chemical hardening process rather than evaporation, which gives it an advantage in filling holes and gaps that would take many days to dry out and have shrinkage cracks using the drying compound. Setting type compounds are available in setting times ranging from 5 to 210 minutes and types that bond extremely well and are very hard and types that are soft and easy to sand. Once mixed with water, the setting type must be used before it sets; any leftover is wasted and if not enough is mixed, another batch is needed to finish the job, and all tools must be very clean or the compound may set up prematurely. This makes the setting type compounds harder and more time consuming to prepare, but they set quickly. Setting type compounds can be used at temperatures down to 45 °F (7 °C).[1] Some drywall professionals use setting type mud for the first coat and a drying type for the thinner finish coat. Setting type compounds do not soften when they get wet, thus are better for moist environments, such as bathrooms.

Special types[edit]

Walls built to slow the spread of fire are called a firewall and are sometimes built using special fire-resistant drywall. Special joint compound for use with fire rated drywall is needed.[3]

Reduced dust formulas cause the dust particles to clump together falling out of the air sooner than regular formulas, thus reducing airborne dust.

Moisture- and mold-resistant formulas are available.

Tapeless drywall joint compound[edit]

In recent years, some companies in Europe, Australia and Canada have developed a new type of drywall joint compound called tapeless joint compound. It can be applied to the joints directly without either paper tape or fibreglass mesh tape. It can save about 30% of labour time for finishing the drywall joints.

So far, every tapeless joint compound is setting compound. There are two type of tapeless setting compound: one is setting compound reinforced by some very strong chemical glues. The other is fibre reinforced setting compound.

Lately a Canadian company has developed a fiber-reinforcement additive which can be mixed with either setting or air-drying premixed drywall joint compounds and turn the regular drywall joint compounds to tapeless joint compounds.


Ready-mixed joint compound is most commonly used in hanging drywall for new or remodeled homes. Application is simple and easy, rarely taking more than three or four coats. When used for new walls, joint compound effectively eliminates all blemishes from the surface of the drywall, such as fasteners, damage, or drywall tape. Joint compound is used to finish gypsum panel joints, corner bead, trim and fasteners, as well as skim coating. In addition, it is also very handy for fixing minor blemishes or damages to walls. It easily patches up holes, bumps, tears, and other minor damage.

Workers applying joint compoundto drywall.

Often referred to as drywall taping mud, joint compound is the primary material used in the drywall industry by a tradesperson, or applicator, called a "drywall mechanic," "taper," or "drywall taper." A similar compound is used in various ways as a sprayed-on textural finishing for gypsum panel walls and ceilings that have been pre-sealed and coated with joint compound. The flexibility and plastic qualities of joint compound make it a very versatile material both as sealer or finishing coat for wall surfaces, and also in decorative applications that range from machine sprayed texturing to hand-trowelled or even hand-crafted and sculptural finishes. In North America the application of joint mud and drywall tape sealer and trowelled joint compound on gypsum panels is a standard construction technique for painted wall and ceiling surfaces. Until more recently in North America, and through the world, several different plasters such as veneer plaster and "plaster of Paris" have been used in a similar ways to joint compounds as fillers or for decorative purposes since ancient times, and the actual make up and working properties of these compounds is much similar. Modern ready-mixes or powder and water mixes are available in a wide range of styles from slow-drying to quick-drying to suit specific demands for use by contractors or decorators.

Mudding is usually done in three layers and it is important to use the correct type of mud for the first and last layer though a multi-purpose compound may be adequate for all coats: Bedding coat or taping coat where the mud is applied to seams and corners and paper joint tape is pressed into the mud (if using a fiberglass mesh tape the self-adhering tape is applied to the joints first and the mud pressed through the tape). The mud used here needs to adhere well and be strong and is called a taping compound; filler coat where the tape is covered and roughly smoothed; and the finish coat or topping coat which is very smooth. A topping compound is soft, smooth and easy to sand.[4] Some sanding of the finish coat is usually required to get a smooth surface. Sheets of drywall usually have tapered edges to provide space for the thickness of the tape and mud at the seams.

While joint compounds are used for bedding tape and initial layers overtop, it is best to apply topping compound for finish layer(s) that level and sand more evenly. Both require thinning for practical application.[5]

Applying and sanding compound is messy work and finished surfaces, such as floors, and air handling ducts need to be covered.

Pock marks are a defect caused by air bubbles which form after joint compound is applied. The bubbles are caused by the inability of moisture to be absorbed into the surface such as when the surface is already painted, has a layer of grease or cigarette smoke, or a drying-type compound applied over a dense, setting-type compound. The moisture exits through the finished surface making bubbles which dry as pock marks. The bubbles can be reworked while the compound is drying to get a smooth surface. Although additives exist to reduce pock marks, their use is discouraged by drywall manufacturers.[6] However, these products reduce bonding so they should not be used on the bed coat.

Health concerns[edit]

Construction workers who sand drywall joint compound are often exposed to high concentrations of dusts, talc, calcite, mica, gypsum, and in some cases, respirable silica.[1] Some of these have been associated with varying degrees of eye, nose, throat, and respiratory tract irritation. Over time, breathing the dust from drywall joint compounds may cause persistent throat and airway irritation, coughing, phlegm production, and breathing difficulties similar to asthma. When silica is present, workers may also face an increased risk of silicosis and lung cancer.[7]

Joint compound mixes manufactured prior to the 1980s often contained a complex mixture of several substances. Among the additives used were asbestos fibers, which provided cohesiveness. Exposure to friable asbestos increases risks of various serious health conditions, including cancer. Joint compounds manufactured from 1980[citation needed] onward were required to have asbestos removed in favor of other compounds, due to legislation banning widespread use of asbestos.

For all of these reasons, constant use of a respirator is recommended by almost all drywall compound manufacturers and is required by some labor authorities.[7]

See also[edit]

External links[edit]


  1. ^ abcFerguson, Myron R.. Drywall: professional techniques for great results. Rev. and updated. ed. Newtown, CT: Taunton Press, 2002. Print.
  2. ^Reese, Charles D., and James V. Eidson. Handbook of OSHA construction safety and health. 2nd ed. Boca Raton, FL: CRC/Taylor & Francis, 2006. 696. Print.
  3. ^Wagner, John D., and John D. Wagner. Ultimate guide drywall. 3rd ed. Upper Saddle River, N.J.: Creative Homeowner, 2010. 25. Print.
  4. ^Ferguson, Myron R.. Drywall: professional techniques for great results. Rev. and updated. ed. Newtown, CT: Taunton Press, 2002. 92. Print.
  5. ^"Drywall Mudding". Retrieved 2010-12-03.
  6. ^"Can additives be mixed into joint compound?". USG Corporation. Retrieved November 3, 2020.
  7. ^ abControl of Drywall Sanding Dust Exposures
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Choosing the Best Type of Drywall Compound

Drywall mud, also called joint compound, is a gypsum-based paste used to finish drywall joints and corners in new drywall installations. It's also handy for repairing cracks and holes in existing drywall and plaster surfaces. Drywall mud comes in a few basic types, and each has its advantages and disadvantages. You may choose one type for your project or use a combination of compounds for the desired results.

What Is Joint Compound or Mud?

Joint compound, commonly called mud, is the wet material that is used for drywall installation to adhere paper joint tape, fill joints, and to top paper and mesh joint tapes, as well as for plastic and metal corner beads. It can also be used to repair holes and cracks in drywall and plaster.

Types of Joint Compound

All-Purpose Compound: Best All-Around Drywall Mud

Professional drywall installers sometimes use different types of muds for different stages of the process. For example, some professionals use a mud just for embedding paper tape, another mud for setting a base layer to cover the tape, and another mud for topping the joints.

All-purpose compound is a pre-mixed mud sold in buckets and boxes. It can be used for all phases of drywall finishing: embedding joint tape and filler and finish coats, as well as for texturing and skim-coating. Because it is lightweight and has a slow drying time, it's very easy to work with and is the preferred option for DIYers for coating the first three layers over drywall joints. However, an all-purpose compound is not as strong as other types, such as topping compound.

A specialty form of all-purpose compound is known as lightweight all-purposemud, which is similar to standard all-purpose mud but is lighter in weight. Some pros find it inferior for taping seams since it contains less binding agent. The lightweight form of all-purpose mud is sometimes used for the first and second coat on seams and for finishing corner bead. It is a very easy mud to sand.

Topping Compound: Best Mud for Final Coats

Topping compound is the ideal mud to use after the first two coats of taping compound have been applied to a taped drywall joint. Topping compound is a low-shrinking compound that goes on smoothly and offers a very strong bond. It is also highly workable. Topping compound typically is sold in dry powder that you mix with water. This does make it less convenient than premixed compound, but it allows you to mix just as much as you need; you can save the rest of the dry powder for future use. Topping compound is sold in pre-mixed boxes or buckets, too, though, so you can purchase whichever type you prefer.

Topping compound is not recommended for embedding joint tape—the first coat on most drywall joints. When applied properly, a topping compound should reduce your sanding time in comparison to lightweight compounds, such as all-purpose mud.

Taping Compound: Best for Applying Tape and Covering Plaster Cracks

True to its name, a taping compound is ideal for embedding joint tape for the first phase of finishing drywall joints. Taping compound dries harder and is more difficult to sand than all-purpose and topping compounds. Taping compound is also the best option if you need to cover plaster cracks and when superior bonding and crack-resistance are required, such as around door and window openings (which tend to crack due to house settling). It is also the best mud option for laminating drywall panels in multi-layer partitions and ceilings.

Quick-Setting Compound: Best When Time Is Critical

Commonly called "hot mud," quick-setting compound is ideal when you need to finish a job quickly or when you want to apply multiple coats on the same day. Sometimes called simply "setting compound," this form is also useful for filling deep cracks and holes in drywall and plaster, where drying time can become an issue. If you are working in an area with high humidity, you might want to use this compound to ensure a proper drywall finish. It sets by chemical reaction, rather than simple evaporation of water, as is the case with other compounds. This means that quick-setting compound will set in damp conditions.

Quick-setting mud comes in a dry powder that must be mixed with water and applied immediately. Be sure to follow the manufacturer's recommendations prior to use. It is available with different setting times, ranging from five minutes to 90 minutes. "Lightweight" formulas are relatively easy to sand.

What Are Dry and Pre-Mixed Joint Compounds?

Drywall joint compound comes in either of two forms: dry or wet. Dry joint compound is the classic type that has been used for years and is still used by professionals. Wet joint compound is a newer product more aimed at the residential do-it-yourselfer.

Both dry and pre-mixed joint compounds contain latex additives to add strength and flexibility. When mixed appropriately, both cover the same amount of drywall: about 125 to 150 pounds of compound covering about 1,000 square feet of drywall panels.

Dry Joint Compound


  • Less expensive

  • Longer shelf life

  • Protected against freezing


  • Difficult to mix

  • Requires extra tools to mix properly

Joint compound in the dry form is a powder that usually comes in large paper bags. The dry product must be mixed with potable water in a separate container to form workable mud. This product is usually not labeled as being dry. Simply, it will be called joint compound with the qualifiers ready-mixed or pre-mixed omitted.

Pre-Mixed (Wet) Joint Compound


  • Perfect consistency

  • Fast start

  • No mixing

  • No extra tools needed for mixing


  •  Spoils quickly and develops mold

  • Must not be frozen

  • Dries up faster in the bucket

  • Heavier to carry

  • More plastic waste

Wet joint compound, called pre-mixed or ready-mixed, is available in plastic buckets. All water necessary has already been added to the joint compound, though it is possible to thin out the consistency with additional water.

Should You Buy an Electric Joint Compound Mixer?

If you do decide to go the dry joint compound route, an electric mixer may help with mixing since the product is heavy and stiff.

It is possible to mix small amounts of dry mud with an electric corded drill and a paddle mixer. But a mud mixer has a strong motor and low torque for turning heavy compounds, even small mixes of concrete. Plus, it saves your drill for what it was made for: drilling.

How much mudding with dry mix would you have to do to justify the purchase of a mud mixer? Since dry joint compound costs virtually the same amount per square foot of coverage as pre-mixed joint compound, purchasing an electric mixer may only make sense financially if you will need to use it often and with huge quantities of dry joint compound: A good 1/2-inch electric drill with a 7 or 8 amp rating will mix a small quantity of mud easily.


For most applications, dry and pre-mixed joint compound are virtually the same, although the pre-mixed option requires less prep work. Common reasons to choose dry mix instead are that it can dry more quickly, is easier to mix and use in very small amounts, offers extra adhesion when using mesh tape, and has an extra-hard set.

Note that skim coating is extremely thin and is considered to be part of a premium level 5 drywall finish, something that few homeowners will ever take on. Since most drywall finishing confines itself to narrow joint strips, you would need to finish around 400 average-sized rooms' joints to justify the cost of the machine.

How To Use Drywall Mud (Joint Compound)

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All purpose joint compound premixed

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DON'T USE DRYWALL BUCKET MUD!! Use this instead...(Quick Setting Joint Compound / \

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