K-SEAL Coolant Leak Repair, ST9501 472ml Multi-Purpose Formula Stops Leaks in the Radiator, Head Gasket, Block, Water Pump Casing, Heater Core, Freeze Plug - Pour and Go - Designed for Canadian Market

Easy enough to use when or if it works didn't work at all for me

THIS IS A VERY GOOD PRODUCT. BUT DON'T POUR TOO MUCH.I discovered a Prestone leak that created small puddles under my car (Audi A3 2012). I went to the garage and the mechanic told me that it was probably the water pump of the cooling system that needed to be changed. He gave me an estimate of 1100$ !! I refused. I did some research on the internet to find an alternative and bought the K-SEAL. 3 days later, I received the product.STEP BY STEP1. Idle the car for 5 minutes or until the arrow of motor temperature in the dashboard is right in the middle;2. Shake the bottle of K-SEAL vigorously for 2 minutes;3. Pour about 130ml of K-SEAL into the collant tank. I suggest you use a measuring cup (**It's written on the K-SEAL bottle that the whole bottle it's good for 12 cylinders.. My car has 4 cylinders which is about a third of the bottle or 130ml). With that said, I think it's better to pour the right ratio the first time and then add more if leakage persist.4. Leave coolant lid open and the engine idle for another 10 minutes.5. Close the coolant lid and then go for a 15 minutes highway drive with the cabin heater on maximum heat and at full blast.I haven't had a leak for 2 months.NB: Before doing anything make sure your coolant is at optimal level (written on your coolant tank). Wear protective glasses and gloves. Be aware that some people say that if you pour too much of K-SEAL it can clog and damage your cooling system... so be careful. If you pour 3 times the product and still have leakage, I think that you should go to the garage. I would also suggest that you use a BlueDriver OBD2 to diagnose the problem yourself before going to the garage so you can locate the problem and maybe repair it yourself/or make sure that you pay for the right repair. Jack your car safely and go under with a flashlight see if you can locate the leakage first... because K-SEAL is good for small leaks. Good luck !! :)

As soon as applied, the leak stopped. Very impressive for a product.

After purchasing a used vehicle. I noticed that the heater core was leaking. I have never used a product like this nor do I know anyone who has used a product like this. I decided to give it a try. It worked for about a month after that, right when it got cold, it quit working. The car was parked for the cold month until I could get it in to get the heater core replaced. The mechanic called me this morning. To inform me that not only dose heater core need to be replaced but also the bottom Rad hose and my radiator as they are both plugged almost solid... So nowNot only do I need to have the heater core replaced which is $1100 bill. I now have to add rod hoses and a new radiator and a complete system flush to this bill as well. Which will be an additional $800-900. It says on the website that it will not plug your engine, but it will plug everything else... I do not recommend using this product under any Circumstance.

Says permanent but you have to keep adding every month or so.

My review is that this product worked for me. I had bad leak near water pump that I had to refill to the line weekly (around 300km), but since I used this product I have gone 6300km without any issue, no leak no refill needed again.It worked for me, I am happy with it