Wynn's Radiator Stop-Leak - Seals Radiator & Head Gasket Leaks - 325ml

Worked a treat, waterpump leaking but couldn't get it done until the cambelt was changed, it fixed the leak until it was done, definitely 5 star's

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 tried what i thought was the best on (K Seal) which didn't work. then i tried this stuff, miles better, worked a treat. If i need to stop a small leak now this is the stuff i would buy again.

Great product does what it’s supposed to

It works! Car was losing ~300ml of coolant a day. I put a bottle of this stuff in, topped up the coolant then ran the engine for 15 minutes and switched the car off overnight. A few drips on a short drive the following morning, and nothing since (4 days, 80 miles). Only supposed to be a stop-gap so time will tell as to how it holds up.

Not sure as some review are mixed review, not sure if instruction were not followed properly... It says at back of bottle that to [warm up the engine with heater control in HOT position] ... meaning, this is BEFORE pouring the additive. Its not clear what is the warm amount. Some car (old) can heat up high temperature in few minutes compared to newer cars. Do not take any risks to open coolant cap as it may be dangerous. Second part it says [add the contents to the cooling system: via the expansion tank if part of the system circuit (2 hoses: out and return), or directly into the radiator of a single hose overflow tank is fitted.] .. WTF lol, i lost it, didnt bother and returned it.

I have not tried it yet. Its not as if I can see any water leaking from my radiator but the water keep shortening. So I thought I should try this product

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.

Ho comprato questo prodotto con mille dubbi e timori. La mia vettura è una Renault Kangoo di venti anni fa che, dopo anni di meritato servizio, ha pensato bene di bucare il radiatore dell'acqua di raffreddamento. Un radiatore nuovo costa, installato, più del valore della macchina (oltre 350 euro) e il mio meccanico mi ha suggerito di provare con un "turafalle" di tipo professionale che ha lui e che mi ha messo con una spesa di 20 euro. Purtroppo questo suo prodotto professionale non è stato molto efficace e, sia pure meno di prima, ho dovuto rabboccare spesso e volentieri il serbatoio di espansione del radiatore. Mi sono allora deciso ad ordinare questo prodotto da Amazon che è arrivato in un lampo e che mi pare abbia risolto il problema. Ho seguito alla lettera le istruzioni riportate sulla confezione e devo dire che, dopo una settimana non è stato più necessario rabboccare con l'acqua il circuito. Sono non soddisfatto, ma soddisfattissimo del prodotto al punto che, per ogni eventualità, ho deciso di acquistarlo per tenerlo di scorta in caso di brutti scherzi. Un consiglio munitevi di guanti da lavoro quando mettete il prodotto, perchè è molto facile bruciarsi con l'acqua bollente del radiatore quando si apre il tappo a vite, bisogna fare molta attenzione ma poi.....se i risultati sono questi, va tutto alla grande!

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This sealant was very helpful in stopping a small leak in my F150 cooling system. Been in there a year or so and still working.

Bonjour Je confirme ce que dit le premier commentaire Produit très efficace Il suffit de laisser tourner le moteur ou de rouler quelques km chauffage a fond, le produit va vite circuler dans tout le circuit et colmater les petites fuite J'avais une fuite depuis des années qui s'aggravait, je devais mettre régulièrement du liquide pour compenser cette fuite, je ne savais pas que ce type de produit serait aussi efficace sinon je l'aurais utilisé bien plus tot De plus son pris est contenu et cette marque est réputée Je recommande ce produit

Works awsome