First, my method is an all day project.
1) Wash the car, very good
2) Clay bar car and be sure you remove dirt and grim
3) Use Mothers Fine Scratch Remover (very fine compound)
4) Polish with Mothers Synthetic Liquid Wax
5) After all that then use Mothers Synthetic Paint Clear Spray coating
And, remember to polish with clean cloths after each step.
Every 3 months I just use the Spray after and good wash.