Quick Stop ~ Stop Leak

Quick Stop


Castle® Quick Stop™ is specially formulated to repair leaks in the radiator, block, heater core and heads in cars and trucks. Quick Stop™ also provides good insurance against future cooling system leaks. The cellulose based, non-clogging formula should be added whenever the cooling system has been flushed. This will prevent leaking from the cleaning process.


  • Cars
  • Buses
  • Trucks
  • Any enclosed cooling system


1. Shake well.
2. Bring engine to operating temperature with the cap off.
3. Pour entire bottle in and allow it to circulate until the leak stops.
4. One bottle is enough for cars; trucks will take proportionally more.


  • 12 oz (#C1236) 24/case


Keep form freezing.


  • Color – Aqua
  • Odor – Slight Ammonia
  • Phosphates – N/A
  • pH – N/A
  • Specific Gravity – 1.02
  • Flash Point – Non-Flammable
  • Freeze Stable – Yes
  • Cleaning – N/A
  • Degreasing – N/A
  • Effect On Paint – None

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U.S. Customers
Castle AutoChem Products Ltd services Canadian customers only.

U.S. customers, please visit the Castle U.S. Website,
or call 1-800-876-0222.