Bar's Leak Cooling System Sealer, 11 Oz.

Discover Bar’s Leak 11‑oz Cooling System Sealer, a ready‑to‑use formula designed to rejuvenate radiators, heater cores, engine blocks and more. This liquid concentrate works on plastic, aluminum and steel components, forming a durable barrier that seals internal, external and coolant‑to‑oil pathways. Its pre‑dissolved blend eliminates mixing steps, letting you apply it directly for fast, hassle‑free protection.

Benefits: The sealant restores heat‑exchange efficiency while preventing costly leaks, extending the life of your cooling circuit. It also reduces electro‑chemical corrosion, keeping coolant clear and engine temperature stable across all driving conditions.

• Universal Compatibility: Safe for conventional silicate‑based antifreeze as well as OAT/HOAT extended‑life coolants, any color or formulation.
• All‑Material Seal: Bonds to plastic, aluminum, cast iron and steel radiators, heater cores, freeze plugs and gaskets for comprehensive coverage.
• Future‑Leak Prevention: Forms a flexible film that protects seals and water‑pump bearings from upcoming wear.
• Electrolysis Control: Helps neutralize corrosive currents, maintaining coolant clarity and system integrity.
• Easy Application: Pre‑dissolved, pour‑in‑ready solution eliminates measuring, mixing or extra tools, suitable for cars, trucks, SUVs and RVs.

Why Choose This Sealant: Bar’s Leak delivers a trusted, professional‑grade formula that tackles existing leaks and fortifies vulnerable points before they fail. Its versatile chemistry works with straight water or mixed antifreeze, giving you confidence on any vehicle. Trust this leak‑stop solution to keep your engine running cool, efficient and trouble‑free.