If you use an aggressive step, it will usually (always, IME) need to be followed by a milder one to remove the micromarring left by the aggressive pad/product. That first, aggressive, step basically replaces the "big marring" that you see in a "before" with much lighter marring. Then you do a Final Polish with a mild product/pad to refine the finish by removing that lighter marring.
Wipe it with a towel that`s damp with a "does *NOT* leave much of anything behind"-QD (I use M34).
Decontaminate that truck before you use the polisher on it
But my honest answer to that Q is: go to Harbor Freight and buy a $40 air compressor, everybody oughta have one anyhow.
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