Abstract: A joint compound tool including a mixer, a hose, and an applicator. The mixer has a hopper and a beater positioned therein. The beater has a rotatable drive shaft that is journaled in the opposed ends of the hopper. A number of first support rods radiate outwardly from the drive shaft remote from the hopper outlet. A pair of intertwined, helical bands encircle the drive shaft and are affixed thereto by the first support rods. A number of second support rods radiate outwardly from the drive shaft adjacent the hopper outlet. A number of blades are secured to the second support rods. A motor is connected to the drive shaft for rotating the beater. A pump is connected to the hopper outlet for pressurizing joint compound received from the hopper. A hose connects the pump to a joint compound applicator having a valve assembly for controlling the flow of joint compound received from the hose and a roller assembly for applying joint compound to drywall.