Before we began choosing what type of joint compound to use, we should address the different types of compounds we can choose from. While there are many kinds of joint compounds to choose from you should know that there are 4 types which are all purpose, light weight all purpose, topping and quick set or accelerated (Hot Mud).
All Purpose Joint Compound
To begin with, all-purpose joint compound is used for all applications. It is mostly pre-mixed/ ready to use and is considered as the traditional type of drywall mud. This type of joint compound is usually sold in 4.5 gallon buckets or boxes containing a plastic bag. In order to use the all-purpose joint compound is by diluting it with water making it as thin as you like. All-purpose join compound can be used as a finish coat due to the fact that it is more difficult to sand which makes a more durable product.
Lightweight Joint Compound
Light weight all-purpose the lighter version of the all-purpose mud and is often used for first and second coat of seams and corner bead. Light weight all purpose is also often used as a finish coat for the reason of being easier to sand. Many professionals believe that light weight all-purpose contains less gluing agents which makes it inferior when taping seams.
Applying joint compound overhead can be tricky
All the four types of joint compounds, Topping is the less used for the reason it is not recommended for taping joints and because it is whiter than the others. However, you can use Topping as a top coat for seams, corner bead and texture applications.
Quick Set or Hot Mud Joint Compound
Quick set or accelerated (Hot Mud) comes in a plastic lined paper bag in powdered form. The plastic lining is responsible for preventing moisture from contacting the powder while keeping the contents fresh. Rather you may know it or not, keeping Quick set or accelerated (Hot Mud) is very crucial. If water comes in contact with the hot mud it will begin to form a chemical reaction which will cause the mud to harden. Once the quick set hot mud harden it will become useless.
On the contrary, there are benefits you will get when looking to purchase this type of joint compound. You will have the option buying hardening agents according to hardening time. For instance, you will have the option of purchasing;
- 5 minute
- 20 minute
-45 minute or higher but you must be aware that working time may be slightly lower than the said time.
Photo credit: Georgia National Guard / Foter / Creative Commons Attribution 2.0 Generic (CC BY 2.0)