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How to preserve cast iron seals from the old westside highway? Answered

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 
 

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petercd (author)2014-01-27

When you say decay do you mean rusting?

Id probably then derust and once dry spray them with an automotive clearcoat.

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