Nonporous and durable, metals are an ideal choice for outdoor signage because they tend to withstand the elements well over the long term, although some varieties may rust after prolonged exposure to precipitation or humidity. Bronze is a particularly popular choice for outdoor signage because it does not rust—although it does tend to be flexible and will need to be attached in several areas to prevent it from catching the wind. Metal can be heavy, so many organizations choose to use lighter, metallic-finish substrates, such as treated Styrofoam, to achieve the same look with less weight. Most metals and metallics can be laser- or rotary-engraved to achieve at least a surface etch; with a pretreatment, some metal and metallic substrates also will accept direct printing.
Sign material – metal
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