How efficient have you folks actually found cedar in keeping the bugglies at bay? I'm thinking more along the lines of a hatstand or band block made from a solid piece of cedar, and used in the open, than a piece of wood or bag of shavings stored in a closed container. Obviously for it to have any real effect it would have to be unfinished, or possibly finished with a simple wax or oil finish rather than a coat of polyurethane, which would seal in the cedar oils.
Are there any bad effects of having unfinished cedar in contact with a hat? Stains or color transfer? Opinions?