I have a converted shop counter that has been made into a four-bank enclosure. The rear wall of the lower two enclosures are bare particle board. The stuff looks horrible, and I would like to know what would be the best (and safest) stuff to paint over it to seal it. Looks too tricky to stick on laminate, and would like to seal the surface for hygiene reasons (and aethetics). Will put a decent backing on once I decide what to get later on. Any advice?