Holts Radweld Plus Coolant Leak Repair, Total Coolant Leak Repair, Industry Leading Car Radiator Leak Sealant, Easy To Use, Seal Engine Block, Cylinder Head, Hoses & More, Suitable For All Cars, 250ml

It seems to work wonders! I've waited a month to see if it actually holds and I have to say I am very pleased. My car developed a serious coolant leak where a metal pipe bursted and everything leaked out within minutes. After fixing this, what I thought was the only leak, the coolant kept slowly disappearing still. I bought this, hoping to avoid visit to the garage after reading the reviews and doing a little research. Extremely easy to use, just pour into the coolant tank and leave the car running for 30 minutes. Month later, coolant still at the same level!! Fantastic, easy to use and and absolute bargain too...

I used two of these on my motorhome to fix a leak. Once I’d ran through the two bottles into the system then topped up again the leak is fixed. Great value for money considering a fix or diagnosis would be close to £100

Had a pin hole leak in my overflow tank so thought I would give this a try before replacing it. Followed the instructions on the back ( used half the bottle ) and let the car get to temp for 30 mins. Set off to work (20 miles) and no leak! TBH even with all the good reviews I still had my suspicions, but 1month later it’s still doing brill!. Only reason for 4 stars is how well it’s works long term. Will update!.

Simple to use, no tools required and a perfect result on my cylinder head gasket

This is amazing stuff. The inlet on the car radiator had problems. Water leaking a lot. Had it replaced, but still had the odd leak. Put the Radweld in and hey presto just like magic, the water leak was fixed. Highly recommend.

I purchased this hoping it would fix the leak in my Mk4 golf GTI. I followed the instructions word for word. It seemed to work, but the next morning there was a big puddle where it had drained out overnight. Did not work for me sadly.

Put half of contents in my cards was loosing coolant sealed system within minutes works realy well

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