The wildlife rehabilitation community may be able to help. The International Wildlife Rehabilitation Council (IWRC) will post your request to their members and place it in the research folder on the website, so please forward it to Kai Williams at firstname.lastname@example.org. The National Wildlife Rehabilitators Association (NWRA) may be able to help also. The NOGA's we receive here on Cape Cod, MA, with waterproofing issues are often behavioural strandings and storm wrecks, where the birds may have lost water proofing due to other contaminants or circumstances - mud, feces, force feeding, inability to preen, etc. I am also exploring other underlying causes of these strandings, and routinely draw blood samples and collect feathers, as well as necropsy any mortalities.
Request for information on "soaked" seabirds"
Lynn Miller, February 20, 2013