It's time to refinish the teak slats on the stern rail seats on my 2000 Hunter 340. I have removed the slats from the seats and removed by sanding almost all of the existing finish - which I assume was varnish. The varnish had broken down and the teak turned black especially along its bottom edge. I assume that this is from the water that collects between the slats. I am planning to add two coats of Schooner varnish and put a coat or two on the under surface of each slat. The under surface was not sealed in the original installation.Does anyone have a better way of caring for these seats. I don't want to have to do this very often.