That was a good (and IMO pretty safe) guess, good thinking :xyxthumbs
Interesting! (And, regarding the ineffective less-aggressive approach, unexpected.) What paper (brand and grit) did you use?
Some people have claimed that when they use *very* aggressive initial steps (e.g. wetsanding) they end up taking off less overall clear. My (good) painter also insists this is true. As I understand it, the wetsanding does more "level" leveling whereas the compoundng follows every contour in the surface of the paint (think "orange peel" as an example) thus taking off some clear that isn't part of the problem...or so the hypothesis goes :think: I've never done a comparison (with measurements) so I don't have any first-hand knowledge, I'm just going by what people I consider reliable have said..so :nixweiss
One way I *do* think wetsanding can be safer is that you can go by individual strokes as opposed to all the work that goes on with each pass of the rotary. I sometimes get nervous about doing repeated, very aggressive passes with the rotary but I don't have your kind of experience to guide me.