Spray paint styrofoam by spraying the paint over a primer such as Mod Podge or Plaster of Paris. Applying a primer to the styrofoam prevents the chemicals in the spray paint from eating the foam.Continue Reading
Paint or apply a thin coat of priming material to the styrofoam. Cover all surfaces that will come into contact with spray paint.
Apply a second coat of primer to help even-out the surface of the styrofoam. Allow the primer to dry completely.
Spray paint the primed styrofoam and allow it to dry.