I have a 1987 GB 42. The aft hatch consists of a sliding hatch cover and two doors. The doors do not extend all the way down to the deck. This configuration creates a cubical space in the aft cabin, indented from the after bulkhead of the cabin - above the level of the main deck. (I know; a picture’s worth a thousand words!) In heavy rain, water drips into the aft cabin at 1 point along the bottom edge of this indented space (right over my wife’s side of the queen berth, as it happens, which, needless to say, doesn’t make her best pleased). My thought is to run a bead of some clear sealant around this indentation, hopefully making the joint between the deck and the bulkhead waterproof. Just wondering what the best product would be.