Set the panel that you're painting up on newspaper, a dropcloth, or something similar to help keep dust down, and control where the overspray goes.
Wipe the panel down with tackcloth immediately before you begin painting...
Begin by spraying a thin coat of the SEM #3936 or #3986 over the panel. Let this dry for about 15 minutes.
wipe the piece down with tack cloth
Then, spray several thin coats of your color over it until you get good even coverage. Let it dry for about an hour.
After the color is dry, and looks good and even (you can keep recoating the color until it does look even), you can spray out a couple of good coats of your clear, again, working to make the coats as even as possible.
Let the clear coat dry for at least 12 hours before you try to put them back into the car.