✔ ALUMINUM-FILLED METAL REPAIR COMPOUND – Professional-grade aluminum-filled polymer designed to permanently repair cracks, blow holes, and casting imperfections in aluminum components including radiators, engine blocks, housings, tanks, and HVAC parts. ✔ HIGH-STRENGTH INDUSTRIAL PERFORMANCE – Engineered for demanding repairs with approximately 8,600 PSI compressive strength and 3,500 PSI tensile strength, creating a durable repair capable of restoring damaged aluminum surfaces. ✔ MACHINABLE AFTER CURING – Once fully cured, the repair compound can be drilled, sanded, tapped, or machined using standard metalworking tools, allowing technicians to restore functionality without replacing expensive components. ✔ NON-SAG FORMULA FOR VERTICAL APPLICATIONS – Thick paste consistency allows Alum Bond to stay in place during application, making it ideal for filling cavities, blow holes, porosity, and irregular surfaces on vertical or overhead repairs. ✔ HIGH TEMPERATURE RESISTANCE – Designed for automotive, HVAC, and industrial environments with temperature resistance up to 250°F (121°C) after full cure. ✔ CONTROLLED WORKING TIME FOR PRECISE REPAIRS – Provides a practical working window depending on temperature conditions, allowing technicians time to properly apply and shape repairs before curing. ✔ IDEAL FOR CASTING DEFECT AND SURFACE REPAIRS – Specifically designed for repairing aluminum castings, radiators, tanks, valves, pumps, engine blocks, and HVAC components where surface defects or porosity require permanent repair. ✔ TRUSTED MASTERCOOL PROFESSIONAL QUALITY – Mastercool products are designed for professional technicians and supported by a trusted U.S.-based company known for reliable automotive and HVAC service tools.