I have a 93 40.5, if it is the same wood, mine is teak. Hunter recommends Daly's Seafin teak oil. You can sand it with 400 grit and apply an even coat of the oil. Let it dry, and wipe. It will produce a sheen layer.
I do not have my manual with me. Perhaps it is on the Marlow-Hunter website.
My companionway side wood was faded and rough, sanded it with 400 grit, (be careful not to go through the veneer) and applied the oil. It is smooth and Nice now.