Wynn's Cooling System Stop Leak

Wynn's Cooling System Stop Leak – 325 ml

Specially developed for marine cooling systems: seals small leaks , prevents oil contamination and rust, and optimizes the reliability of your marine engine or generator – essential in salt water and long periods of inactivity.

Why indispensable on board

• Sealing action: fills and seals microscopic leaks in hoses, gaskets, heat exchangers or radiators — ideal for internal leaks in oil/water coolers.

• Simultaneous limescale and rust control: keeps systems clean and corrects corrosion initiation during downtime.

• Acid-free and gentle on materials: safe for rubber, gaskets, metals, and all types of coolant, including modern OAT types – prevents damage and is compatible with marine systems.

• Practical to use: one bottle supplies systems up to 12 litres – suitable for compact marine engines up to medium-sized generator systems.

Marine-specific benefits

1. Prevents overheating on the go: by sealing small leaks and maintaining cooling circulation.

2. Protects systems during extended periods of downtime , such as winter storage or storage in warm conditions.

3. Minimizes emergency repairs at sea , so you don't have to pay for minor cooling issues.

4. Assures end users of improved reliability and lower maintenance costs.

On-board application

1. Add to a cooled system via expansion tank or radiator.

2. Let the engine idle with the heater/boiler on “warm” for 10–15 minutes.

3. Turn off the engine and let it cool. Inspect visible parts for improvement.

4. Top up with coolant according to the engine or generator manufacturer's specifications.