Radiator Leak-Stop 250ml – Cooling System Sealant for compact tractors (Kubota, Yanmar, Iseki)

Description

A compact tractor that suddenly loses coolant is a frustrating problem — especially during mowing season when you need the machine every day. Often it involves small hairline cracks in the radiator, a leaking hose connection, or a starting head gasket issue. Radiator Leak-Stop seals these small leaks from the inside, so you can keep working while you plan a permanent repair at your convenience.

Why use a sealant for an older compact tractor?

Radiators on Kubotas, Yanmars, and Isekis from the ’80s and ’90s are often still made of copper or thin-walled aluminum and start leaking at the seams over the years. A new radiator for these old blocks is expensive and sometimes simply no longer available. Leak-Stop is then an excellent intermediate solution — you stop the leak temporarily or permanently without having to sideline the machine immediately.

✔️ Seals hairline cracks in radiator, head gasket, and hose connections
✔️ Does not affect rubber, plastic, or metal — safe for the entire system
✔️ Works with any coolant: G11, G12, G12+, G13, and pure water

How to use it:

1. Shake well before use.
2. Add the entire bottle to the cooling system at operating temperature.
3. Let the engine idle for 10–15 minutes — heater on the highest setting, so the product also flows through the heater core.

Specifications:

• Content: 250 ml — sufficient for systems up to 10 liters of coolant
• Compatible with all coolant types (OAT, HOAT, IAT, G11/G12/G13)
• Safe for rubber, plastic, and metal

Suitable for compact tractors from: Kubota, Yanmar, Iseki, Hinomoto, Mitsubishi, Shibaura, Satoh, Honda, and all other water-cooled compact engines.

Note: for a serious leak (visible dripping or steam cloud), a new hose or gasket is always the real solution. Leak-Stop is intended for hairline cracks and small joint leaks, not for holes.