You aren't much further from the contractor that did my polish work than I am - - probably about an additional 300 to 400 miles. The Ruths of P & S Trailer Service (Helena, Ohio) performed the complete polish and palsticoating on my Overlander last winter. It isn't a cheap process - - about $175.00 per linear foot of trailer length. There was an additional up-charge of about $400.00 to bring the panel in question up to the standars of the balance of the coach. They truly did a fabulous job on the coach, and with semi-annual applications of Walbernize, I expect the results to be maintainable for at least a decade if not longer.
The industrial compounds refer to cutting power of the grit in the compound. The compounds typically sold to consumers aren't so strong as when used with a machine process could result in permanent damage if incorrect techniques were applied. The buffer that was employed was a large "belly" type drum buffer with strong cutting compounds to cut the damage from the surface - - which was followed up with fine polish to match the balance of the coach. When comparing the panels today, it is very difficult to tell any difference between the panel that had the exceptionally rough surface and the balance of the trailer that only had normal oxidation and aging.
This is the panel as it appears today:
Good luck with your project!