I ran the parts in the Dry Shine for about 20 minutes or so and then took ’em out to take a look. The parts were clean, smooth, and burr free, but not polished at all (though I really didn’t expect ’em to be). You see, the most important thing to remember with a tumbler is that, in order to get the best result, time your most important factor. The more time parts spend in the tumbler the better job it does. In my case I was too impatient so I deemed the job complete before I really allowed the tumbler the time to do what it could—but in the future I’ll let it run for the recommended time (three to seven hours for heavily rusted parts). Though, the actual time needed to achieve a desired result may vary from an hour to several hours depending on the degree of rust on the parts being cleaned.