Can green board be painted

Yes it can, but first you need to prepare the surface for the new paint.

# Make sure the green board is free of grease, dirt and loose particles, -wiping with a sugar soap solution removes grease. # 'Kill' the green color by applying a white undercoat, or a white first coat. This is necessary, otherwise the green will always spoil the color of the top coat, and you'll never get it right.