A good 2 part epoxy should meet the specs. You would need 2 good thick coats to have the durability. Not all epoxies are created equal so you will need to double check with the manufacture about this as I'm not an expert on clean room specs.
The nice thing about an epoxy is it's easy to apply. Plus it's toughness, resistance to scratching and you can use some harsh cleaning chemicals and not have a drastic affect on the paint film.