Responding to Civeng and retired-chef:
Although both options given may offer the protection you are looking for....
Painting over galvanized steel should be undertaken with care and specific requirements. I've had tremendous success overcoating hot-dip galvanized steel by preparing the zinc...
I'm with HScribner....
More info is definitely necessary to formulate a proper coating system. Actual service condition and intended service life is what I'd really need to proceed with a recommendation. Kevin A. Schweikhart, CSI CDT
Senior Professional
SSPC Protective Coatings Specialist
NACE...