Abstract: An automatic clamping apparatus for paint mixers which applies a direct downward force on a paint container to prevent movement during the mixing operation, includes a clamping plate, a linear actuator, and a current sensor. The clamping plate is secured to the moving end of a vertically aligned linear actuator which moves the clamping plate up and down onto a paint container. The current sensor detects when the clamping plate is pushing against the top of the paint container and the power to the actuator is adjusted accordingly to maintain securing force on the paint container.