| Think of car polish as liquid sandpaper. If you have a scratch on a table top, you can sand it down until the scratch is gone. That's basically how car polish works--it removes paint/clearcoat around the scratch until it's even.
Sounds like he used an aggressive compound that marred the finish, which can be corrected by competent machine polishing.
If you want to do it, you'll need a Porter Cable 7424, a foam polishing pad, and a medium polish, e.g. Menzerna Super Intensive Polish PO83. The PC7424 is very simple to use (plenty of simple guides on the net) and it won't burn through the paint like a rotary buffer can. |