K-Seal™ Cooling System Sealant (8 oz.)

K-Seal™ Cooling System Sealant (8 oz.)
Item #:SOLST5501
Availability:Usually ships the next business day
Our Price:$14.95
Sale Price:$13.95
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The K-Seal™ Cooling System Sealant (8 oz.) is formulated with ceramic micro-fibers and copper fines of varying size to ensure a fast and permanent seal of all holes or cracks (up to 1/32 inch large) in the cooling system. The special chemical formulation can flow into cracks so fine that they cannot even be seen with the naked eye to form a super-strength seal. The crack or hole is actually filled from top to bottom with the K-Seal formula resulting in a complete ‘weld’ and permanent repair. The copper in the K-Seal™ formulation not only contributes to the strength of the repair but it also helps to conduct heat across the crack or hole. This eliminates hot spots that would normally form with a non-metallic repair. Copper is also very friendly to copper, bronze and aluminum radiator cores, which makes it safe to use with all types of radiators. The K-Seal™ Cooling System Sealant (8 oz.) can be left in the cooling system and will continue to repair leaks as they happen. You won’t even notice that there was a problem. Adding K-Seal to the cooling system immediately after each coolant replacement ensures that any and all leaks are sealed thus preventing time consuming and costly repairs. One bottle effectively treats up to 10 cylinders.



  1. Shake bottle vigorously (at least 30 seconds) to ensure that the contents are evenly mixed.

  2. Add the entire contents to the radiator or overflow tank.
    (When adding K-Seal™ to the overflow tank, you may pre-mix the contents with
    1 to 2 quarts of water to ensure effective dispersal into the cooling system.
    Allow time for the product to enter the cooling system if you are treating a slow leak.
    Do not pour K-Seal™ directly onto metal).

  3. The leak will stop within 1 to 3 minutes once the engine has reached operating temperature.

  4. Top up the coolant as necessary leaving the K-Seal in the system for future sealing. K-Seal™
    is compatible with all types of antifreeze.



  • Head gasket

  • Engine block

  • Cylinder head

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  • Heater core

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