Radweld is designed to be added directly into the engine’s expansion tank. You don’t need to drain or flush the system before you use it – just pour and go. Radweld works through the radiator channels to seal leaks without any clogging or damaging effects, so all you need to do is pour it in and let it repair the leak.

When adding Radweld, it’s important to ensure the engine has cooled before unscrewing the cap of the expansion tank as the coolant operates at around 90°C. After filling with Radweld, make sure that the cap of the expansion tank is replaced and tightened.

Radweld works its way through the system seeking out leaks and forming permanent repairs in minutes. The product has been carefully formulated to mix with all engine coolant and antifreeze. You pour it directly into the cooling system, no need to drain or flush the system first. Radweld also provides anti-corrosion protection and prevents future leaks; it will last the lifetime of the coolant in the system.

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