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

Excellent cure for vehicle coolant leaks. Solved my son’s water pump leak when I doubted it could possibly do the job. Still going strong months later!Great price on Amazon.

Land Rover Discovery Sport 9 years. Leak 1L coolant on the ground every week for a month. After using it for two weeks now, no more leakage! It’s magic!

There are cheaper (mostly half the price) of many similar ones here in Amazon and elsewhere.Currently topping up my cooler almost every week or two and appears to be small leak as my garage cannot locate it.Last one i used (different brand, such as Holts/Radweld), which lasted approximately 2 months without top-up).Lets see how long this holds up as compared to others as this packaging says 'Permanent'.---- EDIT: UPDATE after 5 months ----Well its not permanent, but long lasting, as after FIRST 3 months needed topup of coolant approximatly 300ml. Then, after another 2 month, same amount, so leak is slowly coming back. I guess i do have a very small leak.But for the price, it is cheaper as I was topping up weekly of similar amount of coolant.

If you use this product PROPERLY it will work for you. Many of the horror stories you hear about this product if you do a little searching is quite frankly due to the total ineptitude and foolishness of the user.You see this product is fundamentally aimed primarily a vehicles with LARGE engines. You absolutely MUST find out what volume of water your engine uses and then use ONLY the recommended amount of the product to suit! - even if it seems tOo small an amount - you must be accurate AND follow the instructions.If you have a standard MEDIUM engined UK car and you dump the whole lot into your cooling system you are asking for trouble! Use the right amount and if your engines issue is still in the minor stages; you will see good results.Here's my particular situation.Nissan xtrail - petrol - when left standing for a few days upon starting would misfire and hesitate for about 10-20 seconds and then work fine. This is indicative of the head gasket on it's way out gradually weeping coolant into the piston chamber.When you start the car the plug is soaked with water - can't spark and you will get a misfire. As the other piston chambers are fine they get things moving - the water is eventually eliminated out of the exhaust port and the plug dries up sparks and then things carry on as normal.This was confirmed with low water in the radiator and header tank and using an inspection camera down the plug hole to confirm presence of coolant.Got new coolant - added the REQUIRED amount of the product - applied as directed and went for a drive as recommended.RESULT? - No more issues. Coolant levels no longer drop in the header tank and expensive repairs have been offset for a future time (if at all) - as this car has done 150K if I can avoid needing the head gasket being fixed before the vehicle becomes no longer worth running then I have saved a LOT of money.

Great product and fast delivery

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.