Wynn's Radiator Stop-Leak - Seals Radiator & Head Gasket Leaks - Prevents Corrosion & Rust - Compatible with All Coolants/Antifreeze & OAT Fluids - Safe for Hoses & Sensors - 325ml

My car started leaking water from the cooling system, it slowly got worse yet we couldn't work out where it was leaking.I was having to top up my coolant every 2-3 days.Even my local garage said it's going to have to get worse before we can see where it's leaking!!Decided to buy some of this as the reviews were good, poured it in the radiator, drove it around 5 miles, no more leaks!!This has been in my car around 3 or 4 months now and still not had to top up my water.Fantastic stuff, will 100% recommend this product as it's solved my water leak.Obviously for major leaks or split hoses etc this will not be suitable.

I had a really small leak from my coolant system, but enough that I had to top up coolant every other day. I used this and it's cured it amazingly. Really great stuff.

I was losing around a litre a week of coolant via the water pump. I literally just poured this in, idled the engine for 10 mins and then left the car turned off overnight. That was 3 weeks ago and since then I haven't had to top it up once. I'm always scepticle with these additive solutions but certainly for me in this instance it worked with the kind of leak I had. The advantage unlike k-seal is it doesn't leave shiny metal flakes in the coolant reservoir, it's just a milky fluid.

After losing water for some time now I have decided to try this after seeing mixed reviews.I can honestly say that this has stopped the leak .It's only been a couple of days since i have used it and have noticed the coolant hasn't moved at all.I will obviously keep an eye on it, if anything changes I will report it on here, but for the time being all is good.

So far I am very impressed, honestly thought this was a load of rubbish. I poured the whole bottle into the coolant tank and it seems to of completely stopped my coolant leak. Lets see how long it lasts.Max coolant temp is now 105When driving motorway drops to 80-90Good result.Update my corsa has started leaking again, but the leak is minor. Still a good temporary product in my opinion.I also used this on my smart roadster brabus and the leak has stopped for now and the temperature is good.

I tried this to fix what looked like a small leak in the coolant hoses system, it didn’t work in my case but didn’t cause any issues to my car.

Works perfectly, my daughter had a small leak in her radiator and I put this in and it's been perfect ever since. No issues at all and saved us a fortune at the garage! Highly recommend

Useless, radiator still leaked, resultig in headgasket blowing meaning car is now written off!