Wrought iron is an incorrect description.
It is not wrought iron.
It is mild steel that looks like wrought iron.
Don't be fooled.
Only in some Western countries there are still some craftsmen who make wrought iron.
They do this by immersing red hot mild steel bar into the oven filled with charcoal
The carbon content in the steel is increased in this manner turning it into wrought iron.
He then has to hammer it into shape.
You can imagine this is such a labourious process it can be very expensive.

In Malaysia no one does that
So wrought iron is only mild steel bars that are rolled and hammered into shape.
Thats why it still rust and has to be painted.

Wrought iron because of its high carbon content does not rust.

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Added on June 20, 2011, 1:24 am

I have used hammerite for grille
It is very difficult to apply as its really tacky
And you cannot add thinner nor dilute it with spirit
If you do that you will spoil the paint
But then the finishing job is good
And lasts a long time
I used hammerite on my aluminium sliding door because i didn't like the aluminium color
Normal paint won't stick on aluminium but hammerite will
It gives it an anitique finish and that was what I was looking for
Be patient
Needs time to apply
And you probably will need more brushes too.