Increase the nighttime exposure of your signs by using our Reflective Aluminum. We take our .040 and .063 Aluminum and surface it with 3M Reflective Vinyl for the ultimate in outdoor sign visibility. This material should last 2-3 years before fading. .040 Aluminum is like 24 gauge steel, and as thick as 1 dime. Our .063 Aluminum is like 20 gauge steel, and as thick as a nickel. However in both cases, unlike steel, Aluminum won't rust.