A more familiar way of prepping for paint is done in the driveway. Having an air compressor is required for operating air tools but is not an absolute necessity. Small parts such as these can be prepped by hand. If you have the luxury of pneumatic power, you'll want to use a random-orbital sander rather than a fixed orbital. Remember to always place the pad onto the surface first and then activate the sander. This will prevent the pad from free-spinning and cutting into the surface.