
the type of clearcoat and paint means everything.
On the C6, I don't even bother turning the PC on unless it's at 5.5 or 6, with an orange pad, for removal of scratches - even then it takes FOREEEEEVVVVVVERR.......
in contrast, on my motorcycle, setting of 3 with WHITE PAD and #39009 buzzed completely through the paint down to bare metal in a few minutes while I wasn't paying attention.
The contour of the gas tank has a lot to do with that, but wow, what a huge difference in paint hardness.
Crank your PC up to 5.5 if you're trying to remove swirls on a Vette.