Dry Sandpaper

Finding the correct Grit of Wet/Dry Sandpaper for Car Repainting?

2 years ago I sanded my car 400 grit and brought it to a Auto Body/Paint shop for repainting. They did not apply primer I assume and right now the car paint is kind of peeling in some areas. I'm planning on repainting the whole car (currently silver) to OEM black. I'm thinking of sanding it down with 220 Grit and then 400 Grit then apply primer then sand it again but I don't know what grit to use after primer. After that I would apply clear coat.

Can someone please give advice on the correct Grit to use for the entire process?

Inital Sanding
Before Primer
After Pimer
Before Base Coat
After Base Coat
Before Clear Coat
After Clear Coat
Also when should I Dry sand or Wet sand?

Can I just Wet sand everytime or are there steps where I shouldn't use Wet?

initial sanding 4-600
before primer isnt that the same as above?
6-800 wet sand till you get a soft edge wno lines
you dont sand a base coat
you can use 3000 to get dirt nibs or runs out of the clear and buff to shine

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