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The Blue Magic Radiator/Block Sealer is an ideal solution for sealing leaks in engines with large cooling systems. Made in the USA by a veteran-owned business, this 22.8 oz. Copper-colored sealant is designed for use on large engine applications and begins to harden within minutes of application. The product's intended use includes repairing small leaks in cooling system parts such as radiators and blocks without the need for draining fluids or dismantling the entire engine. With its ease of use, Blue Magic Radiator/Block Sealer saves time and money while providing the added benefit of preventing further damage to the engine components. Its versatile applications make it suitable for use in various types of vehicles, fleets, and equipment.