Why choose K-Seal?

The product even professional motor technicians trust when dealing with a leak.

Find a retailer


K-Seal contains a unique formula which permanently seals leaks and instantly repairs serious damage to your engine. If you have a head gasket leak, K-Seal is a fast, permanent way to fix the problem and prevent expensive repairs.

What makes K-Seal so special?

K-Seal is painstakingly tested for the UK and US in the only independent academic facility that can test ASTM D3147. K-Seal is the only product that has been successfully tested on this equipment, making it a standout product.

K-Seal is tailor-made to repair engine damage that could cost you thousands if you don’t do something about it now. Delivered in a simple-to-use bottle, you don’t need to be a mechanic to fix your car – simply follow our clear instructions to shake, pour and go!

The key aspect of K-Seal is that it’s fast. Once applied, all you need to do is start your engine, and leave it to run for a short time. Within minutes it will fix any cracks or leaks in your engine. No mechanics, no expensive repairs – just getting you back on the road straight away.

K-Seal in action!

The Car Doctor shows you just how easy it is to apply K-Seal to fix your engine. No fiddly mixing of formulas – just a simple case of shake, pour, and go!

Why K-Seal is the right solution for your engine woes

Not only is K-Seal a number one bestseller in the UK and worldwide, it’s  also the product professional motor technicians trust when dealing with a leak.

Testing has demonstrated that K-Seal sealed leaks in test conditions 100% of the time. That’s why so many professional motor mechanics refer to K-Seal as “the miracle in the little blue bottle.”

The good news is that, despite being the number one bestselling total coolant leak repair solution, K-Seal is still available at a modest price. Why pay more when you can have the best for less?

Find a stockist >

“Would you recommend K-Seal?”

Don’t just take our word for it – here’s what a number of our happy customers have to say:

“I’ve used it myself and it works! And I wouldn’t recommend something I haven’t used.”

Without a shadow of a doubt – because we’ve seen it work.”

“I had a Micro K Reg and I needed to use something for the radiator quickly. I found K-Seal, used it and it worked and to this day there have been no problems. That was about a year ago.”

I used to use it when I was an AA patrolman, so I have experience of it and know it works.”

A trusted brand you can rely on

“K-Seal is the best stop leak I’ve used!

This product stops leaks like no other product that I have used. No time consuming flushing just add and go. I stopped leaks on an EGR cooler on my school bus It has been over a year and no leaks. This saved me over $1,000 dollars!”

Robert, Haugers Auto

“That worked. Thanks for all your help. You saved me $3000!”

Brian Campbell, USA

“I had seen all sorts of horror stories on the internet about ‘blocked oilways’ and ‘snake oil’ for similar products. I was motivated to buy this product because I had had excellent results with K-Seal.

I had a minor break to the head gasket of my 300Tdi Defender, consequently skimmed and repaired, but despite pressure testing I experienced occasional symptoms of the original problem. The independent Land Rover garage determined that there was a tiny fault in the head, they used K-Seal and it has been problem free ever since.”

Adrian Cherrett, UK

“2 1/2 years ago, I used K-Seal to stop a head gasket leak on a ’97 2.2L Sunfire motor, with 175K miles. Poured it in as directed, and the leak stopped within an hour. Nearly 2 years, and 25K miles later, it has remained relatively leak free!

There are many similar products on the market, but in my opinion, this is the best.”

Richard Whittemore

“Your product is a miracle product. I had a leak in my water pump and I didn’t have money to repair my water pump. I bought k seal and it repaired it instantly. It was a life saver – thank you for creating this product.”

Christine Young, South Carolina

What do customers think of K-Seal? View more case studies

Expert Advice

Head Gasket Failure? Cracked Head or Block?
Leaking Radiator?

Expert Advice

Where to buy K-Seal

Have any of these symptoms? K-Seal could save you thousands on a workshop repair. Search for a stockist today!

Find a stockist