I recently used an industrial epoxy paint system to refinish an enclosure at work that had to stand up to chemicals and constant humidity.
The "paint" itself wasn't paint at all: more like really thin epoxy. It was barely spreadable with brushes and rollers, and there were limits to how much it could be diluted with thinner to be sprayed.
That said, it was absolutely amazing in its durability and rapid cure time, and it would be my first choice for any harsh-environment finish in the future, especially on my vehicles.
One thing worth noting is that the retail markup on this paint was ridiculous. Standard pricing was somewhere around $200 for a two-gallon kit (one of each component of the mix), and bought on a company account I think it was around $80 for the set.
Jonathan