My parents brought a large (6*40)metal storage container many years ago. They live in warm weather ( San Diego) but it does rain on occasion on the container leaked. My dad and brother tried numerous times to pack the leaks but without much success and it has laid unused for years. Being that they have no plans to get rid of it, I want to make it usable and was think of adding some sort of auxillary metal roof with a pitch that would divert most of the water. Any suggestions of the best way to go about this ( or an alternative solution) would be much appreciated.