K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

It’s amazing stuff. Sorted a mysterious coolant leak in minutes. First time since I got the car that I haven’t had to top up after a long journey. Seems to be a permanent fix too.

Worked so goo, great value for the money

Good product helppul

Does exactly what its meant to do, very easy to use, just pour into coolant tank.

car was leaking coolant slowly, put in and no more warning about coolant low level, been 12 months already, highly recommend

I purchased a bargain car that I knew would require some work to put it right. When I purchased the car the engine was lacking power and the idle speed was hunting (going up and down). As the engine oil was ok I thought I'd try cleaning out the fuel & exhaust system first using Injector cleaner, turbo cleaner fuel additives and diesel particulate filter cleaner additive to burn off any soot built up in the exhaust. After I'd tried all of those each one on a full tank of fuel I'd probably done 1,500 miles and the car had more power and the idling had improved. I then noticed the car had started to lose approximately a pint of coolant over 10 miles and I think there was a slight whitish haze in the exhaust smoke which shouldn't be there as the car is a diesel. I wondered whether I'd caused the coolant leak by using the fuel additives as they contain detergents. I suspected the coolant may be escaping via the head gasket or maybe via the exhaust gas recirculation cooler into the exhaust so decided to try K-Seal. At first I thought the K-Seal had fixed the leak but after a couple of days the car started smoking again and the coolant loss was about the same as before I had tried the K-Seal. Unfortunately during those couple of days the K-Seal had made a proper mess inside the coolant header tank and as the header tank is made of white plastic lots of copper particles and gunge can now be clearly seen coating the inside of it above the coolant fill level. I have since wondered whether the previous owners may have already used a leak repair to hide a head gasket problem and if so whether it would have impaired the efficiency of this product but have no way to know if that was the case. I decided to try one more cheap fix before considering a garage repair so purchased a competitors product that was cheaper than K-Seal and does not contain all the copper particles. The cheaper product has currently stopped the coolant loss but it would have mixed in with any remaining K-Seal in the engine block so maybe they are complementing each other now. In conclusion, this probably does work in many cases but in my case, it didn't work. I am pretty sure that in many other cases it probably also makes a proper cosmetic copper splattered gunge mess inside the header tank. In hindsight, I think I'd only try the K-Seal again if I could add it directly into one of the cooling pipes so the whole bottle doesn't start off in the header tank or alternatively I'd add it to a warm system so the thermostat would already be open. Also if there is ever a next time on another vehicle personally I'll try the competitor's product first as it was cheaper and didn't make a mess inside the header tank.

Good product as expected

This really does work!!! My car has been leaking coolant for a few weeks now and I have been topping it up every few days with coolant until I had a chance to take it to the local garage. Then I found this small little bottle of K-seal and it does exactly what it says. When it was delivered and I saw how small the bottle was I thought oh no! But I shook the bottle and added it to my coolant tank. It’s been one week now and the coolant level is still the same. Not dropped at all. Hopefully I won’t need to buy it again but I will definitely recommend it. Give it a go it’s SO much cheaper than a trip to the garage!!!

Seems to stop leaking from plastic header of the radiator.

Fungerade mycket bra. Jag är nöjd. Bara att skaka burke jättenoga först. Sen hel i allt

efficace dès la 1ere utilisation. plus de problemes de fuite depuis. un miracle ? pour le prix cela vaut le coup de l'essayer plutot que d'engager de gros frais pour les réparations.

Utilizzato con molto scetticismo un mese fa su di una fiat punto che consumava da tempo acqua e a freddo andava a tre cilindri perché la candelasi bagnava.. Ha funzionato alla perfezione,il primo giorno ha smesso di andare a "tre" e nel giro di pochi il consumo di acqua si è fermato definitivamente. Al momento altamente consigliato.

I had observed oil leak signs in the coolant, Probably faulty oil cooler gasket or Engine head gasket. I poured this liquid to the radiator and drove my Thar crde for almost 30minutes. Next day had gone for 400kms drive as well. No further oil leakage. Coolant looks clean now. Its been almost 3 weeks now. Oil mixing with coolant has stopped perfectly.