[EC900]

Surely wait for that clear coat to cure before sanding and that depends on how heavy the coat(s) was sprayed. Using rattle can process can be tricky, much probably is just a “frosting” affect from edges drying out faster than the main area. Whichever removal method, do it slowly and evenly and check the results each time so you don’t overwork and cut into the undercoat. Last thing you want is one area being so obviously polished out than the rest of the car panels.

My dealings had some small touched up areas of sloppy clear coat applications that had an orange peel effect and an overspray so bad that the masked tape line was visible. How this let a body shop is beyond comprehension.
I picked up some Griots Complete Compound (a least-aggressive compound) and used my 10”random orbital, went over the areas and was surprised by the results with minimal effort with this mild compound. I wished I took pictures as this method worked wonders in quick order, afterwards a polish and wax really blending the area well.

It turned too old outside (here) now to try a complete DYI “paint correction” with a more aggressive compound such as Griots Boss Fast and Boss Correcting creme that are designed for more severe defects, I intend to use one of these two for the spring cleaning with a 6” random orbital.
Plenty of Griots How-To and advice on the YouTube.