🚀 Seal the Future of Your Engine! Once sealed, it lasts the life of your engine. Quickly fixes leaks in head gaskets and more! Compatible with aluminum and cast iron engines. User-friendly formula for hassle-free repairs. Safe for your cooling system when used correctly. Lasts lifetime Permanent seal Universal fit The Hi-Gear HG9048s Insta-Seal is a powerful 236ml engine block sealer designed to permanently fix leaks in head gaskets, cracked cylinder heads, and more. Compatible with both aluminum and cast iron engines, it ensures a safe and lasting solution for your vehicle's cooling system.