I'm sure that there are urathane options for steel.
I was chatting with my wife and she remembers loads of boats in the US that had urathane treated hulls. I've drawn the conclusion based on responses here and some googling that it's not popular in the UK. Thanks for indulging my curiosity.
Other than the outrageous cost, why don't people use Urethane? For example U-Pol Raptor . It's used in trucks and leaves the steel underneath pristine for decades if applied well.
The quietest PC fans by far are made by Noctua. They are designed to be quiet at high Ron, are well balanced and include vibration isolation. I use them on my PC, and I don't hear them ever. http://noctua.at/en/products/fan
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