Real estate boards, election signs, event wayfinding, open-home directionals and short-term site notices all serve a similar purpose: a printed panel designed to remain in place for weeks or months while keeping the cost per sign low.

Corflute is the standard choice because it is waterproof, lightweight and easy to transport in flat stacks. Its hollow flutes also allow ground stakes to be fitted directly into the board. Double-sided printing is common for these applications, as the signs are often viewed from both directions of traffic.

The flute direction must match the intended mounting method, so this needs to be specified before printing rather than adjusted afterwards.

Once a sign is expected to be there in five years, the economics flip and a cheap board becomes the expensive choice. Aluminium composite — two thin aluminium skins over a solid core — is the standard permanent panel: it stays flat, does not rot, rust or absorb water, and is light enough to fix to render, cladding or a fence frame without a structural conversation. On the Gold Coast the coastal salt load is a real factor, and the classic failure is not the panel at all but rust weeping down the face from cheap steel fixings, so specify stainless or nylon fixings on anything within reach of sea air [VERIFY: Hassan]. On a permanent panel the printed vinyl and laminate on the face wear out well before the substrate does

Indoors the brief changes from survival to finish, because people stand close to the sign and photograph it. Acrylic is the premium interior board: it has depth, takes a clean cut edge, and mounts off the wall on standoffs for a shadow line that a flat panel cannot produce. Foam PVC is the practical middle — solid, smooth-faced, prints dead flat and shows no internal structure, which suits wall signs, directories and anything seen at close range. MDF and MDF block mounts suit warmer interior work and mounted artwork where you want a timber-cored panel rather than a plastic one. All three are indoor materials in Queensland humidity, and MDF in particular is strictly indoor

Compliance signage is a different buy again, because the content is prescribed and the sign has to stay legible for the life of the site. Metal and aluminium composite panels are the usual build: they take a UV-laminated printed face, hold their shape on a fence or a post, and do not become brittle the way a thin plastic board eventually does in full sun. Site boards and induction signage are often large and read from a distance, so the panel needs fixing at enough points that it does not drum in wind. Corflute is a legitimate short-term stand-in for staging and temporary works, but it is not the board for a sign expected to be legible at the end of a multi-year project

Corflute is corrugated polypropylene, made from two plastic skins with hollow flutes between them. Similar in structure to cardboard but entirely plastic, it is waterproof and will not swell or delaminate. It is also one of the most cost-effective rigid outdoor boards, which is why it is widely used for real estate, election and event signage.

There are two main limitations. Corflute is rigid along the flutes but more flexible across them, so wider panels may require additional support or a frame in the weaker direction. Prolonged UV exposure can also make the polypropylene brittle, causing cracking around stake holes rather than simply fading.

In Queensland conditions, it is best treated as a short-term, months-not-years material, with expected service life confirmed for the specific installation and exposure.

Aluminium composite panel is a reliable choice for permanent Australian signage. It is flat, rigid, rust-resistant and relatively lightweight for its strength, while providing a durable surface for printed vinyl with a UV laminate.

Thicker panels are generally suited to larger signs or installations with fewer, more widely spaced fixing points. However, the fixing pattern is just as important as panel thickness—a thinner panel with four well-positioned fixing points can perform better than a thicker panel supported at only two points.

Solid aluminium sheet provides a heavier, more durable option and is commonly used for traffic and statutory signage. Both materials are well suited to coastal environments, where salt exposure can cause coated steel to deteriorate much sooner.

These three materials are primarily suited to interior signage and share one key limitation: none is ideal for prolonged exposure to harsh outdoor conditions.

Acrylic offers a clean, premium appearance and can be cut with a polished edge, making it a popular choice for reception and lobby signage. However, it can be brittle under impact and expands and contracts with temperature changes, so outdoor applications require appropriate fixing methods and allowance for movement.

Foam PVC is a solid, closed-cell sheet that is waterproof but sensitive to heat. Prolonged direct sunlight can cause it to bow, making it better suited to indoor or sheltered applications.

MDF is a timber-based board intended for indoor use. If moisture enters through an exposed edge or fixing hole, the core can absorb it, causing the board to swell permanently.