The Trim-Tex Auto Mixer fastens to the top of a mixing bucket with four hooks for stability, allowing a contractor to pour drywall compound and water and start mixing immediately. The electric mixer has a trigger assembly starter and a locking mechanism so a mud mix can be started slowly and then sped up (using the dial-adjusted speed on the motor) and set to go by itself for hands-free operation. Trim-Tex also promotes the use of its own Mud-Max drywall compound additive in addition to water for greater strength and adhesive performance for all drywall compounds, textures and plaster products.