Painting Help Options

[dexterity]

I decided to paint my own spoiler, I bought the same color of my car in a spray can at an automotive store.

I sanded then wet sanded the spoiler, and I finished applying a few layers of primer.

my question is, would it be better if I wet sanded the primer before I apply my paint?

should I wet sand my last layer of paint before the clear coat?

what's the best way for me to prevent chipping and what not

thanks everyone