HIGHLINE AFTERMARKET, LLCSKU: 770-BD205 | Minimum Purchase Quantity: 6

Sale price$28.04
In stock (18 units), ready to be shipped
Interchange 00205,770BD205,ZEC10412,
Net Weight (lbs) 1.08

Blue Devil Radiator & Block Sealer


BlueDevil Radiator & Block Sealer is an easy-to-use formula that will repair and seal leaks in radiators and/or engine blocks. It does not contain solid or fibrous materials and will not clog or harm cooling systems. It will bond to plastic, cast iron, aluminum, alloy or metal. BlueDevil Block Sealer is compatible in gasoline and diesel engines. It is a guaranteed permanent radiator sealer.

  • Permanent repair for radiator and block leaks.
  • Works effectively on plastic, aluminum and/or metal radiators
  • Contains no solids or fibrous materials.
  • Safe and Easy to use.
  • ASTM D1881 & ASTM D3147 Compliant

NOTE: Dirty or clogged cooling systems should be chemically flushed before installing BlueDevil Radiator & Block Sealer


  1. IMPORTANT: When engine is cold, remove radiator cap.  ENGINE MUST BE COLD TO AVOID SEVERE BURNS.
  2. If radiator is full, drain enough antifreeze to allow space for BlueDevil.  If the vehicle does not have a radiator cap, product may be installed through the top radiator hose.
  3. IMPORTANT: POUR SLOWLY!  Starting with a cold engine and the heater on maximum setting, slowly pour BlueDevil into the radiator as the vehicle idles.
  4. After installing BlueDevil, replace radiator cap. Allow vehicle to idle for 45 minutes with the radiator CAP ON and BlueDevil in the system
  5. Top off radiator with clean antifreeze or water. BlueDevil can remain in the system.




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