Aluminum exit signs are durable and able to be finished with various textures and techniques. Generally the housings come in two forms, either extruded or die-casted aluminum. Casted aluminum housings are thicker and are typically available brushed with a clear coat or are power-coated whereas extruded housings are typically painted with textured finishes. Cast-aluminum exit signs are often designed with the goal of satisfying architectural specifications which require more versatility in finish options. Therefore, you'll see the extruded aluminum housings have fewer options and cost less.