How do you spray metalic paint without leaving streaks (auto wise)?

Reduce your air pressure and open the fan. Spray a test pattern on some paper to make sure the paint is being sprayed evenly. (Not heavy on top or bottom) Then spray in different directions. Cris cross the spray path. Then on the last coat, back away from the panel at least two feet and spray one mist coat diagonally. And make sure you are allowing plenty of flash time between coats.