What exactly is the difference between forced rotation and dual action polisher movements?
With polishers, we have dual action units (also known as random orbital) and rotary units. DA units will not only spin in a circle, but the backing plate will bounce away from the center of the unit, providing you with two different movements. Rotary units will only spin in a circle and when you add the second movement that DA units have, it cuts down on heat generation and greatly reduces the possibility of damaging the paint during polishing.