Altough I know that there is no such thing as a maintenance free boat,I have been searching the net for info as to how I could restore my carvel planked 33 feet hull so that it would be possible for the new coating to last for years instead of having to be redone every year or two. I have Gougeons Bros. leaflet that mentions routing between planks, inserting a spline in thickened epoxy, and fairing the hull. The outside of the hull is then saturated in epoxy. The interior is left intact, and must be well ventilated. I have also read about a 2 part compound called polysulfide. Is this a caulking that is used between planks once they are routed. How about glassing the exterior in epoxy? Will humidity absorbed by the wood from the interior crack the hull.