The gold standard for sign panels nationwide. Baked on enamel glossy finish guaranteed never to rust. Lightweight and yet rigid. Perfect for hanging signs at your most prominent properties. .040 Aluminum is like 24 gauge steel, and is as thick as 1 dime. Our .063 Aluminum is like 20 gauge steel, and is as thick as a nickel. However in both cases, unlike steel, Aluminum won't rust. Guaranteed for five years against rusting, chalking or breaking.