How to preserve cast iron seals from the old westside highway?
Hi, we own a collection of the former seals on the West Side Highway, which are made of cast iron. Over the past 2 weeks or so, we're noticed they've begun to decay. Does anyone have any suggestions for how to save, as it would be a shame to let apiece of history go to ruin. Any advice greatly appreciated. They are shown here: http://www.smpub.com/ubb/images/09/nycseals.html