I removed the caulking from around the hinges, where they enter the lid and cap because right from new I could tell water was getting behind the caulking, rust stains on cap. It looked like they did a good job of placing the caulk but it wasn't adhering to the hinge metal, maybe they were oily when they were caulked at the factory. There was some surface rust on the metal in the cap and lid hinge and hinge sleeve which I removed then sprayed with rustoleum zinc coating. I picked up some 3m 4000 marine caulk which I hope will be a good choice for this application. I was wondering what caulking others have used and how well it has stood up?