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Liquid Copper Head Gasket & Block Repair



Simple 1 Step Formula
Anti-Freeze Compatible
Copper Heat Transfer Additive

Bar’s Liquid Copper Head Gasket & Block Repair is specially designed as a 1 step solution for preventing and stopping coolant leaks occurring as a result of a damaged or cracked engine blocks or leaking head gaskets.  Bar’s Liquid Copper Stop Leak & Block Repair contains an added copper component which serves to transfer (or absorb) excess heat and to help reinforce the seal for longevity. 

This product is recommended for use in vehicles that do not overheat or require coolant filling after allowing the engine to idle for 15-30 minutes.

  • Seals leaks near the combustion chamber and head gasket

  • Powerful liquid glass and copper formula

  • No need to drain cooling system

  • Special One-Step / antifreeze compatible formula

Product Code: HLC1L
Bottle Sizes: Net 20 (600 mL)


Safety Data Sheets (SDS)
Technical Data Sheets (TDS)

How does Bar's Leaks Liquid Copper Head Gasket Repair 1 Step work?

This product contains a blend of anti-freeze compatible sodium silicate and reinforcement particles which harden and form a strong seal to stop leaks near the combustion chamber.  Bar's Liquid Copper Head Gasket also includes added copper particles to absorb and transfer heat from the engine and reinforce the seal.

Bar's Leaks Radiator Stop Leak is best installed directly into the radiator or through the upper radiator hose.  If no access direct access is available, install in a pressurized coolant reservoir.

Run/idle the engine for 15 min, turn off the vehicle and allow the engine to cool.

Cooling systems >2 years or >40.000 km should use Bar's Nural before application.

Yes, Bar's Leaks Head Gasket Repair 1 Step is compatible with all 50-50 anti-freeze.

1 bottle treats to 9.5-19 liters of coolant.
For smaller systems use 1/2 a bottle.
For larger systems use 1 bottle for every 9.5 liters

The cooling system must be clean and free of other types of stop leak products. If it is necessary to remove other anti-leakage substances, or if the engine is over 2 years old or has traveled over 40,000 km, clean the system with Bar's Leaks Nural  before using Bar's Leaks Radiator Stop Leak.