A D/A (dual action) sander can be a real time-saver. It spins as well as orbits, creating a smooth and even cut. When used properly, a D/A sander can be used for topcoats, surfacers, or even stripping paint from panels. It's important to keep the pad as flat as possible on the panels. Avoid digging holes with the edge of the pad. Smooth, even pressure is the key. Electric D/A sanders are available as well, but are not as versatile, especially when wet sanding! DOH!
Price range: $29 to $200