Metal building condensation

You need to remove the interior moisture and/or provide some level of insulation for the interior metal structure surfaces to provide a temperature gradient to prevent the condensation from occurring on the surface of the metal structure.

Spraying the interior surface with a rubberized paint will help reduce the surface condensation by raising the temperature of the surface contact but a good high volume dehumidifier will fix the issue no matter what the temperature differential is.

Moisture from air only condenses when the surface it contacts is below the dew point temperature. Lower the dew point temperature of the air below the contact surface temperature and it will never condense.