Clean your folding screen. Metal folding screens work best for creating the look of antique copper, but plastic screens can be used as well. If you've chosen a metal screen, use your sandpaper to lightly sand the entire surface of the screen.
Lay your screen on a drop cloth. Hold your spray primer can six to eight inches from the surface of the screen and use a sweeping motion to prime the entire surface. Allow the primer to dry and turn the screen over to repeat the process on the other side.
Hold the copper spray paint can six to eight inches from the folding screen and use a sweeping motion to paint the entire surface. Allow the first coat to dry and repeat the process to apply a second coat.
Flip the screen over and repeat Step 3 on the opposite side. Allow paint to dry and remove the screen from the drop cloth. Examine the surface and use the remaining paint in the can to touch up any missed spots. Allow the paint to dry and stand back to admire your piece.