Norton Urethane Structural Adhesive – 40 minute. The 4618 is a versatile and fast two part urethane system for bonding and repairing steel, aluminum, flexible, semi-rigid and rigid plastic and fiberglass. All products perform the same on all materials. Just select the working time that best fits your needs. OEM quality and Performance. Outstanding corrosion protection. High strength structural bonding. 100% solids - no shrinkage. 220 mL. 4618