My 10 year old Murray mower deck just broke in half from rust. The engine is running fine so I gave the whole thing to a local small engine guy/tinkerer. Maybe he can salvage the engine and mount it on another deck. Mowers rust out rather than wear out for me. Is there anything I can spray or brush on the underside of a new mower deck to resist rust? I thought of Fluid Film or wheel bearing grease, but thought it would be scoured off by the grass. Would spray undercoating or roof cement give a wear resistant surface? Thanks in advance for any advice.