AridDek is extruded from an aluminum alloy (6005-T5 aluminum) that will not rust. However, as with other decking materials including wood, composite, or even concrete, steel products that come in contact with AridDek can rust and even stain your AridDek aluminum deck surface.
Do not store metal objects that could rust and stain your deck on AridDek. Avoid metal working on AridDek, as well. When installing iron railings, protect AridDek with a non-plastic drop cloth to prevent grinding dust and weld splatter from settling on the surface of AridDek.