3M™ SMC/Fiberglass Repair Adhesives are two-part urethanes or two-part epoxies used to bond backup strips to SMC (sheet molded compound), FRP (traditional fiberglass) and primed metal. Our adhesives provide a full range of hardness, flexibility and worktimes for jobs such as reinforcing the backside of plastic components on vehicles. They use automatic mixing and offer excellent sag resistance.