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For what it is worth, in a study of long term maintenance costs that was performed by Boatbuilder Magazine some years ago, the results showed that Ferrocement was one of the most expensive materials to maintain. It came in right ahead of Steel which was found to be the highest maintenance material and conventional wooden boats which were also at the high end of the scale. Aluminum and then fiberglass came next with cold molded construction coming in best of all.
Jeff
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