I have had hairdryers inside the hull blowing warm air around it. I have put the vacuum cleaner inside it for about 4 hours. I left the inspection port open for most of the spring and I had small pots of salt inside the hull to absorb the moisture and last week I closed the inspection port and left it for a week when I came back and checked it there was about 500ml of water just sitting in the boat. When I feel the inside of the hulls deck and sides they feel bone dry. I just can't figure out where this water is coming from P.S the boat is stored in a garage.