Have structural steel to coat let us suggest the proper coating for the job. This i670 photo top-coated with i990v offers great structural steel protection in a “sauna room” type of environment, I’m sure Paulino is standing by.
Amherst, NS, Finished photo shown with p346, below that is Grey epoxy primer p4402 by Polyval which seals the existing surface to provide a solid base for finishes like p346