This is interesting and now I question which is better.
I have always wet sanded the entire panels existing clearcoat with
600 before making a spot repair and reclearing the whole panel.
It was suggested to me on this forum to use a gray scotchbrite
pad instead of the 600 wet sanding for existing panel prep.
Is there any reason I should stop sanding with the 600? after
seeing these test results it sounds like it would be better than
the gray pad.
I know the wet sanding is slower but it does level out the surface better
and seems to be more "scratches per inch" (better adhesion?).
This is strictly a new clear over existing factory clear question.