need to make a rusty steel plate sign 9mx2.4m similar to design on hume freeway project thomastown?

Answer 1

In this size, you are talking about Cor-Ten steel, which rusts without flaking off. If you use it, be sure the supports are something else or are mounted where they will not be long term wet - the wonderful Water Garden in Ft. Worth had Cor-Ten light posts and someone decided the bolts at the bottom were ugly and put soil down around them with plants and kept them watered and the steel rusted through, fell and killed a couple of people - human failure but to be avoided.