� The preferred filler to use when repairing large rusted-out metal areas and cracked or shattered fiberglass to its original strength � Contains extra long strands of chopped fiberglass that provide extra strong bonding power � No-sag formula lets you use Long 'N Strong in cracks, holes, edges, behind panels or any other difficult area that needs strong reinforcing � Rustproof and waterproof � With Blue Cream Hardener