I have coated several different things in my four years of spraying urethane. For example.....Jeeps, Broncos, Blazers (all very commone items to spray), canoes, boat bottoms, nerf bars, grill guards, vehicle frames, dump truck beds, show vehicle frames, tool boxes, industrial manufacturing items, tool box liners (for snap on tool box), complete vehicles, and even Cowboy Hats (don't ask).
I'm even thinking about coating my boat trailer with it.
There is an endless market for sprayed polyurethane that people will continue to recognize. Just like Wildfire, more people will think of different items to coat with this stuff.
Remember, ask for it HOT!