I am trying to assist a young man in the caribbean with his boat. He has very little money and depends on me for good advice. Today, he dashed his 1990 4 winns 21' against a dock and it left a gash about the size of a person's hand in the exterior. A local man has offered to repair it, but crime and dishonesty are rampant where he is and he asked to me go online to get information about how such a thing should be repaired because he's afraid the dude may be misleading him. I would be so grateful for a brief explanation of how such a repair should be done properly and how long it should take. The damage is far above the water line. Thanks very much for your prompt reply...time is of the essence here.