In fact, it’s one of our most popular products, and drivers and mechanics alike have been using it for decades to repair leaks in car radiators. These failures can occur via internal corrosion after using poor quality coolant/antifreeze, or through failure to follow the appropriate coolant change schedules. After pouring the product into the system, you can replace the thermostat and hose before circulating the product through the system. Halfords Autocentres Ltd is authorised and regulated by the Financial Conduct Authority (FRN 755309) and acts as a credit intermediary and not a lender, offering credit products provided by a limited number of finance providers, including Klarna Bank AB (publ)].

Holts Wondarweld 500ml | Halfords UK Holts Wondarweld 500ml | Halfords UK

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. Radweld has been carefully formulated to mix with all engine coolant and antifreeze types, and works quickly to fill small holes and gaps, resealing the system to permanently repair leaks.

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Holts SEALit Permanent Cooling System Leak Repair

Having dispersed into the existing antifreeze coolant, SEALit permeates throughout the coolant system and forms an enduring seal in unwanted cracks and holes. Steam from your radiator and an overheating engine doesn’t have to ruin your day or cost a fortune to repair.

It seals holes in everything that Radweld does, and also seals leaks in the engine block (coolant to air leaks), cylinder head gasket, freeze plugs and water pump gaskets. 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. You can trust Wondarweld to seal leaks safely without causing damage or clogging the system, with professional results. It circulates through the cooling system to locate and repair small holes and cracks, resealing it to prevent further leaks and corrosion. The Holts Wondarweld is a heavy duty engine block and cylinder repair which can be used at home to repair leaks quickly and cost-effectively.