Typically, you see me responding to questions about Metasys or system integration topics. I am looking for guidanace on a project where I spend my Saturday mornings volunteering. The Golden Spike Chapter of the Railway and Locomotive Historical Society is restoring a locomotive that was built in 1881. See http://www.trainweb.org/GoldenSpikeL...23project.html for more details. We have completed rebuilding the tender tank and need to find a coating for the interior of the tank that will keep it from rusting from the inside out. When these things were in daily service they would almost always be full of water which minimized this problem. This will be a museum piece that will occasionally be operated on special occations so it is a much bigger concern. I thought with HVAC cooling towers and other storage vessels involved in buildings someone on this forum might be able to point us in the right direction. Thanks for any ideas you can share.