Painting a rusty chain link fence?
Personally, I have had very good results with the rust converters. For painting a fence use a cheap brush. You can work the paint into all those little nooks. Spraying would be a big waste of paint. Don't go too fast or you will have it all over you.
If you are going with the original metallic finish, there is a galvanized paint made for fences.
If it's worth doing, it's worth doing right. If you wouldn't put your name on it, it ain't done right!