Nancy,
Your interior modules are
fiberglass. But they can be painted. After proper surface preparation (thorough cleaning,
light sanding, thorough cleaning) I had good luck using Rustoleum "Appliance" spray
paint.
If your modules have surface imperfections, these can be filled/repaired with a variety of options (including: fiberglass resin with a colloidal silica adhesive filler; "Marine-tex"; and/or Interlux surfacing putty) before you paint.