Cornmeal will do nothing as far as preserving the wing. If you don't have a dry preservative on hand, you can get Borax at the store... it was used for years before modern dry preservatives became available for the profession.There is nothing to scrape off it just dries right up. Takes about a month in a cool dry area inside a box. It’s not really traditional “taxidermy” it’s more just preserving a wing. *shrug*