I am currently restoring a Catalina 27. There are three very old winches on her, all with horrible pitted rust. I tried everything to get the pitted rust off, and finally a fine bastard file did a pretty good job. I then polished them with finer and finer sandpaper and emory cloth and the beautiful bronze shines like new under the deceased chrome plate. The problem is that it rusts pretty easily when it rains. What can I put on the bronze to keep it from rusting? Thanks.