I too changed the sliding hatch cover by simply painting it the same nonskid as the rest of the deck. Looks great and safer too.
Since the teak trim piece was the only remaining piece of teak on the boat, I painted it too, Awlgrip, Off White like the rest of the topsides and cabin sides.
On the interior I painted it, the hatch cover, with the Pettit Off White interior paint along with the rest of the headliner. I also have clear lexan hatch boards to allow for plenty of light.
