What can I paint plasterboard with?

I have new plasterboard in a bathroom. What should I paint it with?

If standard plasterboard has been used then apply one coat of British Paints Acrylic Sealer Water Based Undercoat then two coats of British Paints Clean & Protect Kitchen & Bathroom. If the plasterboard has been waterproofed then seal it with a sealer binder then two coats of British Paints Clean & Protect Kitchen & Bathroom.