K-Seal ST3501 Pour and Go Head Gasket Sealer, 16oz, Permanent Repair for Blown Head Gaskets, Cracked Heads and Blocks

LR2 2012, There was a Small crack on the radiator and my coolant was leaking, This is fixed. One month now I didn't see a single drop of coolant. excellant.

Thanks

Worked perfectly

it took me replace new radiator this cause only more blockage on the radiator and did not seal anything it just seal the radiators rows

It didnt work . The manual said i habe to pour it on cold engine but i did it on a half/cold engine . So it could be my bad . Not sure

There was a coolent leak through exhaust,after using this product the leak arrested.

It did not seal it still leakage and coolant system has pressure

لم يعمل المنتج اضاعة وقت و اموال روح لورشة لاصلاح العطل خاصة اذا كانت المشكلة في راس المحرك Head gasket leak

Très bon produit. Très efficace.

das Zeug hat in nullkommanix das Thermostat abgedichtet. Immerhin... Ich glaube, dass so Zeug unter optimalen Bedingungen funktionieren kann, ich habe es sicherheitshalber bei einem alten Auto angewendet, bei dem der Wechsel der ZKD nicht wirtschaftlich gewesen wäre, also ohne wirtschaftliches Risiko. Dass das Thermostat allerdings sofort verstopft, hatte ich nicht erwartet, das dürfte der ZKD - und damit dem Auto - dann den Rest gegeben haben. Friede seiner Asche. Ich werde es nicht noch mal kaufen.

Bit of my background. I'm an ex-Honda technician of 24 years. But I quit the dealership over 10 years ago. I feel I'm quite experienced with cars. Honda's at least.I still drive a 1996 Honda Odyssey, here in Aug 2025. Beginning of this year, I noticed a mysterious coolant loss. Maybe a 1/4 liter every 2 -3 weeks. Also some intermittent stumbling or misfiring when engine is started, but clears up within 2-3 seconds of starting. Also noticing excessive pressure being relieved when opening the rad cap. Typical head gasket symptoms. Then I noticed a few drops of coolant on the ground. That ended up only being a leaky radiator. Found a cheap new radiator on Rockauto and replaced it, hoping that fixes all coolant loss issues. No luck. I continue to just drive it and topping up coolant. July comes around and the misfiring after start up is getting worse. At times, taking up to 20-25 seconds to clear up, and now it feels like it's multiple cylinders misfiring. The new radiator is leaking as well. I assume the excessive pressure from exhaust in coolant is the cause. Given the van's age, 500,000 km's and host of other issues it's had in the past year or 2, it's not worth the time and energy to fix a head gasket. I fear this is the end of the van. My wife is thrilled and ecstatic, she really wants a new or newer vehicle.I've never been one to believe in any of this "quick fix in a can". But at this point, its worth a shot as there's nothing left to lose. Bought a bottle of this K-Seal Head Gasket repair here on Amazon.Just after driving the van, the engine is hot. I opened the rad cap slowly and noticed the coolant was low. I didn't bother draining any more coolant as I hoped it was low enough to fit the whole bottle. I was wrong, only managed to pour in just over half the bottle. I started up the engine and ran for 40 mins. Shut off and cooled for 3 hours. Reached under the radiator and opened the drain just enough to pour in the remainder of the bottle. Started engine, no misfiring. Perhaps just a coincidence. Ran for another 40 mins then shut off for the night. Next morning, I started it up, still no misfiring or stumbling. Drove to work just fine. started up after work, again no stumbling. It's now been a week and a half of regular driving and I finally checked the coolant level. It was full, no top up needed. New radiator stopped leaking too. Still early, but so far the results are extremely positive. I'm thrilled and ecstatic. Wife is not. I will update if it shows signs of leakage again

Usado en un coche de circuito al que se le exige el máximo constantemente en el que ya comenzaban a traspasarse los gases de los cilindros al circuito de refrigerante elevando la presión del mismo, tras aplicarlo según instrucciones del fabricante se resolvió el problema hasta tal punto que a día de hoy tras casi un año y varios eventos rodando a altas rpm sigue solucionado evitando destapar ls culata. Estoy impresionado por el resultado.

My review of the product application is as below. Car: BMW E36, 1995, 325, sedan, single vanos, M50 engine, Mishimotor expansion tank filled with BMW blue coolant. Location - Kuala Lumpur. Issue: Mild white smoking with slight coolant loss (about 50ml a week). Suspect coolant leaking from head gasket into combustion chamber. No signs of coolant to oil leak nor oil to coolant leak. Water temperature is stable. Application: Applied KSeal Ultimate 3 days ago into expansion tank (pumped out some coolant from expansion tank to fill kseal) and followed the instructions. Smoking stopped about 20 mins after engine was at operating temperature. No signs of overheating. Result: Since applying KSeal ultimate 3 days ago, drove a total 450km - mix of short distance, one long distance (120km) and in heavy traffic. Had done high rev driving up hill about 80km round trip) twice as well. No smoking to report and temperature was normal so far. Coolant levels checked in the morning and didn't seem to drop. So far so good, will update here if there's any issues. Very happy with the product.