Back in the UK I was taught to degrease galvanised "Crittal" window frames with mineral spirits, prime with calcium plumbate ( a lead based primer) and finish with an alkyd undercoat and gloss paint. Looking around the products suggested on US painting sites, I guess I was stuck in the dark ages, because I cant find mention of that technique for painting galvanised steel anywhere.
Sat here in California with recently hot dipped mast bands to make look shiny white, I realise I do not have the experience to judge which combination of primers, etch coats and or top coats available here would be most durable.
What do the painting specialists here recommend for that perfect bombproof brush finish? I have got as far as vinegar to degrease the surface, roughed up with a scotchbrite pad. What next please?