Remember a few things:
1. Polishing is actually metal removal.
2. A Dremel (even at its lowest speed) operates at a VERY high speed.
3. Even with a fine polish, a Dremel WILL dish out the workpiece, round off sharp edges, blur letters, and give a REALLY uneven finish.
If you want to polish metal, you'll need to get:
1. A dedicated motor/polisher. Your bench motors run about 2500 to 3000 rpm. This is a good speed for polishing.
2. You'll need a number of wheels; for the best results, you should not mix different grades of polish on the same wheel.
3. You will need to not only mount the wheel to the buffer, but carefully balance and true the wheels prior to adding polish. This will give a good, smooth finish, even and ripple free.
4. Loose and bound muslin wheels are the best bet for polishing at the beginning and intermediate level. Use good 6" wheels--8" wheels when you get used to it. Avoid ANY felt wheels until you get your polishing techniques down.
And, finally--as a poster above said it--slow, steady and smooth does the trick. Always, TAKE YOUR TIME. Go slow. It's always much better to polish just a wee bit more--than to apply too much pressure and see a dished surface appear--or notice that your roll marks are now blurred.
Curved surfaces do present a challenge--but there's a way to do that without a Dremel as well.
Hiding in plain sight...