You could hit it with a can of "hammerite" spray paint.It comes in a few colors & is made for metal applications.If You get the textured finish,it can help to cover any blemishes also.Good luck with the project

A quality armless office chair will be difficult to find. You might try this route, go to http://www.chervan.com/. They are a KD frame maker that sells to the trade, small manufacturers and re-upholsterers. They make some office furniture frames that wouldnt be that difficult to assembly without the arms. Then you can have a custom finish and upholstered to match your desk. But you would have to go through a local shop or try their frame link. I hope this helps.

Wrought iron will rust. Any iron will rust. I scrape and paint mine every year or three. :) They are more than 50 years old now and still in good shape, although I sometimes get rust marks on the flagstone from them. We have also bought aluminum and wooden sets from HD for the deck. What we have had for the last four years cost around $300-400 for a set with six chairs (two that rock and swivel) and a table with tile inserts. They have a mesh sort of seat and arms and are very comfortable. They aren't foldable, but we could probably stack them if we wanted. No signs of wear yet and they stay out all year. They even held up under our 58" of snow tear before last. I love teak, but I like the aluminum because the squirrels always seem to chew on the wooden sets and they end up looking a little ragged.

The trouble with making a fabric covering for a lawn chair is attaching it to the chair and getting a strong enough fabric to withstand the weight of a person sitting. They do sell webbing for chairs that can be covered with a cushion