The fixed keel on my C22 develops a spot or two of what appears to be a rusty substance that has "weeped" out of a crack or two on the keel. When fresh, this substance is moist and smell vinegary. This makes me think there is some kind of osmosis problem. I cleaned up one spot last spring by opening the crack, cleaning and drying it, and fairing it with filler. After hauling I noted the crack had returned, and later, found the same rusty substance. Perhaps water is working its way down one of the keel bolts...Gee, I don't like to think of weakness at that important point! If anyone has experience with this please let me know. Thanks.