The CONVEX is a simple, fast process that works on many different materials. Our Convex is flat-backed with a coating of hot–melt glue, which is heat–activated. The Flat Backs can be easily applied using heat to produce a durable and long–lasting convex effect. When the glue is heated, it melts, penetrating the garment of the material. As it cools, the glue hardens and permanently affixes the convex to the garment.