Check out this link, and also vids guide on this site.
http://pinballrehab.com/1-articles/pinball-restoration/playfield/205-repairing-clear-coated-playfield-planking
As far as the dark swirls in your yellow paint, that's very hard to get rid of completely. I had the same thing with my Williams Grand Prix.
I posted where I was also using novus 2 and a ME. It was brought to my attention, that the Novus 2 was not the best thing to use,
Here is a link to my post about that
https://pinside.com/pinball/forum/topic/cleaning-playfield-3
Good Luck!