As a very rough guide on the correction side....
My Black GTI was covered in swirls when I bought it in March this year, after the necessary prep I have enhanced the paint up to this point so 90% of swirls removed with some deeper marks remaining.
To do this I have used:
DA polisher (DAS6-Pro)
Yellow Lake Country compounding pad with Menzerna Fast Gloss, followed by:
Green Lake Country polishing pad with Menzerna Intensive Polish 3.02, followed by:
White Lake Country polishing pad with Menzerna Final Finish
Sealant/wax wise I used Auto Finesse Rejuvinate to cleanse the paint so the wax could bond properly, then waxed with Swissvax Best of Show.
Above will be stripped off shortly, then the Blackfire package applied (Gloss Enhancing Polish to cleanse, Wet Diamond Sealant finishing with Midnight Sun Wax).
At some point I will go for full correction with my rotary, when time allows