Pin holes (again)

I just spot sprayed 3 areas with Concept AU after modifying the root rib area IAW the Salve modification to the Genesis-2. I let the paint cure for 2 days, because parts were sticking out of the shop and I couldn't close the doors to heat the shop (70 day/40 nite). Today I wet sanded it out with 600, then buffed the new paint out with liquid buffing compound (with water) and a wool buffing pad. The 600 scratch marks are completely gone and the paint has a high luster with only one buffing. However, the sanding scratches in the old paint (in the blend area) are quite visible and I was forced to remove them with traditional methods, 800, 1000 then several buffing passes with increased pressure and adding water to the buffing compound to increase the cutting action on the old hard paint.
So, what does this mean? Countless hours can be saved on a complete re-finish job by sanding the paint out while it is quite new and green enough that the 600 scratch marks are completely removed by the cutting action of the buffing pad and compound + water.
JJ