The grit of sandpaper needed for car paint depends on the specific task at hand. Here are some general guidelines based on the search results:

• 40 to 80 Grit: This grit range is very coarse and is not recommended for small clear coat scratches and other similar applications. Instead, it is recommended for any rough sanding that needs to be done prior to bodywork, as well as shaping body filler.

• 120 to 180 Grit: Use this grit range for flattening out scratches, feathering edges of body filler, spot putty sanding, and light rust removal.

• 320 to 400 Grit: This grit range is much finer than the previous ones mentioned. It can be used for pre-primer sanding, rough primer sanding, fine sanding spot putty, and final body filler sanding. It is recommended to use a sanding block too.

• 600 to 800 Grit: This sandpaper grit range is perfect for sanding the surface before applying the final coat of paint.

Its important to note that the grit of sandpaper needed may vary depending on the condition of the paint and the specific task at hand. For example, if youre touching up your cars paint, 1,500 grit is a good starting point, though youll need to be cautious about sanding it off too much. Its better if you have 2,000 grit. Additionally, sandpaper in the 24 to 36-grit range is most appropriate for projects where the automobile has rough areas along the surface that need to be flattened out.