In this example of a custom aluminum sign, Graphic Impact used a material with the name of E-Panel. The sign consists of a sheets of aluminum over a solid PVC Sheet (a plastic material making it very dependable for both interior and exterior applications. One of the best materials to print in full color and customized to any shape or size. Not only do we print the signs with the most durable outside inks, but we also add a clear coat. Highly recommended!