Invest on the more known brands for car care...like Meguiars or Mothers, though Turtle is the most common. You wax your car probably once in 3mos, depending on how much you use it and how often you wash it. You don't too much makes the paint fade.
When buffing, I see them only using one side/half of the tool. Always tilt it so that the middle part won't touch the car's body.
Lastly, you might wanna check out the ClubMitsu site/forum, they will know the shops, or someone who sells those, for a better price. And Please, don't put a wing on it, unless it's a GT-A version spoiler