This is constantly my first choice for finishing gakvanised products . I Choose it OVER Powder Coating.. It does need attention to detail to get very good results as not folowing Dulux veary good rcomendation will eventually result in disapointmnet. So after obtaining excelent results over the last 5 or so years on many projects I highly recomend.

Painted underside of vehical and roobar. Looks good but first wash with small gernie pressure washer it all peeled off.Mid price range with $1 a can life span

Note: will likely work for your needs, but pretty poor at painting over aluminium (interior) window frames. My frames were brown, so about 3 coats needed to get good coverage, which was understandable. The problem was even with allowing 24hr drying time and using thin coats, the paint adheres poorly. When I pulled off my painters tape, it puled up strips on the paint along the edges in random spots too. I had come too far, so i re-taped, re applied, then went around with a stanley knife so the tape would come away crisp. It looks fine, as long as no one ever even mildly scratches them. This was recommended to me by bunnings.