K-Seal Avis 

We have a Fiat Ducato motorhome and the day before we were due to go away the radiator started to leak, losing nearly a litre of coolant in 10 mile. I’ve never been impressed with radiator sealants they never seem to last long but paid over £20 for the 479ml as it was the only option at the time and I am really impressed with it the leak stopped within a few minutes and I’ve done about 500 miles and it’s still not leaking, I was going to order a new radiator on our return but I think I’m going to wait and hopefully it’ll live up to its claim of being a permanent repair.

The Chevrolet Trans Sport, amazing car by the way, had a new gasket 40k km ago. But after the 40k km I had the same problem again. Several times the temp became to high and there was a lot of air in the cooling system.
Also there was a little bit of white smoke of the exhaust pipe and sometimes I had a bad start.
I've used Kseal. Directly in the radiator. It's a wonder. Problem solved after a few minutes. The white smoke has gone, the temp is very constant and the engine runs as new
The Kseal should be permanent they say. I hope so.

We just got back from a holiday in Oz. Jumped in the car to come home and after about 5 miles the heater wasn't getting warm. Pulled into a supermarket and saw the coolant level was almost empty. Weird as it was full when we left home 3 weeks ago. Filled with coolant, heater warmed up and off we went. Lo and behold 5 miles down the road and heated went cold. Pulled off the motorway onto a side road and saw the coolant was almost empty and leaking onto the road. Called out the AA who came out. Saw the leak, said it looked quite small likely a stone chip. We then shot of to euro parts and bought some K seal and the AA man applied it stayed with the car and us for a good 40 mins to make sure it was fixed and lo and behold again lol, it's sorted. Absolutely amazing stuff. He also said in the unlikely even it will leak K seal could fix that leak for the rest of the engines life. So if that's the recommendation of an AA driver I'm more than happy. Thanks very much K seal great job. Thanks

Don’t do it!!!!
Put this garbage in my Fiat 500 because I had a slight coolant leak. Blocked up my heater matrix leaving me with a £400 bill.

Well I just put this product in my Civic Si(cracked block) and it has stopped using coolant(reservoir every 200 miles, 300,000 on the odometer). Amazing, I've kept the RPM's down but seriously the coolant loss has stopped, heater still works and no overheating. I wouldn't have believed it but I can only hope it's long term-Thanks K-Seal!

I haven’t used it (yet), I’ve read the reviews both positive and negative; but how can I be sure it won’t cause damage to my Jeep Wrangler Sahara 2.8 Diesel? I’m unable to visually see where the coolant leak is originating from.

This stuff is the real deal. And I’ve been let down before by “stop leak” products. I was nervous to try it as i had already replaced my entire radiator from a previous failed product that blocked my system up and blew the top tank on my radiator, but i still had a blown head gasket that i could not afford to replace. I emailed Colin to try put my mind at ease and he was very honest in his advice. I went ahead and added the k-seal to my system and i still can’t believe it, but it worked. It’s been in my car for 6 days now and it hasn’t used a single drop of coolant whereas before i was having to top it up daily. This has saved me a lot of money and a massive headache. Don’t bother with any other product, just go straight for k-seal. I should have to begin with. Once again, thank you Colin, and the k-seal team!

My impala started a slow drip and over a couple of days became a faster drip. It appeared to be coming from the radiator. Stopped by the auto parts store and picked up a bottle of K Seal. Poured into overflow and when I got back to work, the leak had stopped. Worth every penny.

Stunned. Saved my car from the scrap heap. Recommended.

Worst product ever they say it doesn't do any damage it's bs it ruined my brand new radiator I replaces few months ago. My mechanic said this stuff ruins your radiator good luck

Absolute brilliant, definitely deserves a 5 star review, works well with my 2006 ford fiesta Ghia 1.6. no issues, no more leaks.

Do not buy this ever. It will coagulate and ruin your engine. I put this in my coolant overflow reserve to stop a slow leak, I was going through a gallon of antifreeze about every month. Now the coagulated chunks are getting stuck in my smaller passages and causing it to blow coolant out of the bottom radiator hose. I am now going though a gallon of coolant a week. Even after replacing the thermostat, the water pump, and the return coolant hose as well as thoroughly the flushing the system several times now I still have pea sized chunks of kseal in my system. If anyone knows a way to get this stuff out without it costing thousands of dollars, let me know.

Excellent product. Fixed the "weezing" sound coming from the heater core inside the car. Always amazed at products like this which save a trip to the repair shop.

I have a 2006 Volkswagen beetle three bottles put in it didn't seal my water pump now my car stuck on the side of the highway hi Steve well I put three bottles in and it says guaranteed it would work on the water pump guaranteed and that you guys would replace the bottles but from what I'm seeing you're not replacing nothing so putting three bottles in didn't seal it then that stuff is not guaranteed like you guys say on the bottle you're right they never did but it says right on your bottles guaranteed to work or we will replace your bottles well you don't live up to your word cuz it says it right on the bottle replace if doesn't work and now you're not going to replace or give my money back because it says it on the bottle itself okay I will be posting this on other sites about the case Hill and not their guarantee because it is not guaranteed to work and it is not guaranteed that you guys are going to replace the bottles okay so how do I communicate with them and you have yet produced anything to communicate with them the website know nothing have you gave me

Didn’t work
Had leak from freeze plug behind fly wheel was quite a bad leak thought I’d try it
Ran engine on tick over for a hour still leaking

I too, was losing about 2 pints of antifreeze on each commute. After pulling the pressurized surge tank, I still couldn’t find a leak. I had minor, white vapor coming from the tailpipe, so I assumed it was either an intake manifold or a head gasket leak, that was getting into the power cylinder. I was also getting a spark plug code on #1 cylinder.
I read the reviews on different brands of sealer and decided on K-seal.
After following the directions, my antifreeze loss was gone and the engine code disappeared.
K-seal definitely works!

Jayson

I get a sneaky suspicion that alot of these reviews are false 5 stars. I've never seen as many people with 1 review to their name and only reviewing this product. It's almost as though this company has either employed a person or persons to leave 5 star reviews to hike up the status of the product. I'm not suggesting deliberate dishonesty as I'm sure the company knows that doing so could be totally illegal and could result in hefty fines by regulators. But it just doesn't add up to me that there are so many 5 star reviews that are left by reviewers that have never reviewed before or since. This product did absolutely nothing to fix the leak on my cooling system but I suspect that's more to do with where its leaking rather than the product. Never the less having read the negative as well as positive reviews I would in my experience with the product air on the side of caution and contact the company for advice before purchasing and wasting your money like I did. This is a fair review of my experience and thoughts on what I've read regarding the product. It's up to each individual to make up their own minds at the end of the day.

Edit in response to Colin.

Thank you for replying Colin and attempting to address what I've written. I suppose what I'm actually trying to say is that even on your product website there are all these claims of guaranteed success or your money back, yet I can see no where that actually states to 1. Contact you for advice first or 2. That the product actually might not work at all. When people read the words guaranteed to work they have an expectation that it will work and therefore have no need to contact you for advice, as you've already stated it will work. Then when it doesn't work people like myself decide to review their experience and apon visiting trustpilot discover that there are all these positive reviews. Now I'm not suggesting that there couldn't possibly be any positive results from using the product, of course there will be. However, it is extremely easy to create email accounts to leave a review and your remarks regarding the process involved are just not accurate. Secondly I note that you continuously respond to negative reviews as though your technical knowledge of the product far exceeds peoples experience of the product. Almost as though its the customers fault that your product didn't work on their car. Its not the customers fault at all it's the products fault as it doesn't do what it claims in those particular cases and therefore the product is not living up to its claims. Perhaps it's time your company reviewed it's guaranteed to work claim as its quite evident from your companies responses on this review site, that unless your representatives have given their "technical knowledge" verbally then the product isn't guaranteed to do anything. Your assuming of course that the customer has no technical knowledge of how these products work. Yet your website doesn't state this.
As I've said I don't doubt this product has worked for some but please stop with the marketing ploy that this is some amazing product that will save people hundreds in repair work when the fact is, it's like playing the lottery only with your car engine as collateral.
I stand by my review the product didn't do what it said on the advert and so for me it's money wasted. I recommend anyone thinking long and hard before buying what's described as a wonder cure for your leaks but in this day and age its understandable as most people don't have the money for hefty repair bills. As for your comment regarding my name or symtoms of leaks, I don't need to correspond with you after the event. It's too late the product didn't work for me and reading your responses to people with bad experiences I've no doubt that I'll go round in circles to get a refund so I'm not interested. Likewise with my symtoms, not much need to go into detail to be told if you had contacted us first we would have told you it won't seal that leak. This is a case of advertising that exaggerates the capabilities of a product and itl work for some but not others and that's fine. It would be better though if representatives like yourself didn't try to rubbish a customers bad experience when it's the products claims that are rubbish.

My mechanic could not find any leaks in my coolant system yet the coolant tank emptied out every day! I contacted K-Seal by email to ask if they thought their product might work in my situation and got a response within an hour. Great customer service! Like many others, I was a bit sceptical about K-Seal but tried it the next day and, to my surprise and joy, problem solved. No more coolant tank leaks! Very happy with the product and the customer service. Highly recommended.

Without further ado, I want to say that K-seal has saved me a great deal of expense. It completely solved the head gasket problem. I am really lucky to have come across this product. You can use it without hesitation. Also, the approach of customer service on the subject was excellent. They were very helpful in every sense to make every step go smoothly. Many many thanks