BlueDevil Products Head Gasket Sealer liquid repair — 1 Quart, non-particulate formula for aluminum & cast engines

BlueDevil 38386 Head Gasket Sealer (1 quart) is a ready-to-use liquid formula that repairs and seals head gasket leaks, heater cores, freeze plugs and minor cracks without solid particles.

If you discover coolant in the oil, overheating, or white smoke from the tailpipe, a damaged head gasket or small crack can be the cause — and full engine disassembly is expensive. BlueDevil Head Gasket Sealer offers a technical, non-particulate solution that bonds to metal, aluminum, cast, alloy and plastic surfaces so you can address many common coolant leaks quickly. The product is compatible with both gasoline and diesel engines and is formulated not to clog cooling passages or harm engine components.

How does this sealer work to stop a head gasket leak?

The formula flows into the cooling system, reaches the leak site, and chemically bonds to the metal edges around the breach, forming a flexible, heat-resistant seal. Because it contains no solid particles, it stays suspended in solution until it contacts the damaged metal surfaces where it cures.

• Bonds to different metals: aluminum, cast iron, alloy and plated surfaces
• Forms a permanent, flexible seal at the leak site after curing
• Non-particulate formulation avoids clogging radiator or heater passages
• Works in both gasoline and diesel cooling systems

When should I choose BlueDevil instead of a full gasket replacement?

Use BlueDevil when the leak is external or due to a localized head gasket breach, a warped head with small cracks, or failing heater cores and freeze plugs. It’s intended as a repair option that can prevent immediate teardown when the damage is repairable with a chemical sealant.

• Good for isolated leaks, small cracks or pinhole corrosion
• Suitable for emergency or cost-conscious repairs
• Not a substitute for mechanically warped heads beyond specification
• Recommended to diagnose severity before deciding on permanent mechanical repairs

How do I apply BlueDevil Head Gasket Sealer safely and effectively?

Installation follows a simple fill-and-run routine: pour the sealer into a warm, circulating cooling system according to label directions, then allow the engine to reach operating temperature so the formula can flow to the breach. After a specified run period and cool-down, the system is rechecked and topped up as needed.

• Ensure the engine is cool, then add the product per instructions
• Run the engine to circulating temperature to carry sealer to leak points
• Reinspect cooling system, hoses and fluid levels after treatment
• Follow safety and disposal guidance on the container

Will this product harm my engine or clog cooling passages?

BlueDevil is formulated without solids or particles, which reduces the risk of clogging heater cores, radiators or small coolant passages. Its chemistry is designed to bond at metal interfaces rather than deposit particulates throughout the system.

• No solid fillers that can block narrow passages
• Compatible with typical engine metals and plastic components
• Safe for gasoline and diesel systems when used per directions
• Keep to recommended volumes and diagnostic checks to ensure success

Who is this for: BlueDevil 38386 Head Gasket Sealer is aimed at DIY mechanics, fleet technicians and owners seeking a cost-effective repair for external head gasket leaks, minor cracks, heater core faults or freeze plug leaks. It’s ideal as an emergency fix or when professional disassembly is not immediately feasible — but it’s wise to confirm that the damage is within the product’s repair scope before bypassing mechanical replacement.