Originally Posted by propr'one
I'd like to post that in my experience the only way to get rid of swirls effectively is with an orbital polisher, cutting pad, heat and a cutting agent.
Second that. You can do a reasonable job by hand and for good paint it will look decent. But if you want mirror-like finish, you'd need a random orbit polisher. That gizmo just does the job like no other.
Too bad you can't rent one. Looking at getting a Porter-Cable XP but it's a bit of overkill of a once a year job, isn't it?