Cover it
Julie,If you varnish the teak (I do), cover the cabin top and hatch boards when you are not sailing. For most people, this means your teak's finish is protected 99+% of the time. Even an inexpensive blue tarp will do the trick. Plus, if you have even the smallest rain leak thru the cabin top, hatch, or hatch boards (50 mph winds WILL drive lots of water thru the hatch board slots), that problem is solved, too. Eric