Blown Head Gasket Repair (HG-1)

Blown Head Gasket Repair


  75 Reviews

Bar’s Leaks Professional Head Seal Carbon Fiber Blown Head Gasket Repair is the strongest antifreeze-compatible solution on the market, period. It penetrates a leaking, damaged or blown head gasket, drying to form a seal that’s actually stronger than the original head gasket itself.

DIRECTIONS (Note: Protect from freezing.)

  1. Install only in a cold engine. Shake bottle well. Remove radiator cap and pour the correct amount of product in per the dosage chart. Fill radiator and reservoir / overflow tank to proper level and reinstall radiator cap. TIP: Radiator cap may be on top of radiator, on engine, mounted on a hose, or a screw cap on the pressurized reservoir overflow tank.
  2. Turn heater on hot and fan on high. Run engine until thermostat opens or normal operating temperature is reached. Turn vehicle off and allow engine to cool. This may take up to 30 minutes or longer.
  3. Top off radiator (add coolant as needed) and either run engine at high idle (approximately 1200 RPM’s for vehicles with a tachometer) or gently drive for 15 minutes. Turn vehicle off and allow engine to cool.
  4. Top off radiator and leave Bar’s Leaks Head Seal Blown Head Gasket Repair in system for continued protection. Drive vehicle as normal. Most leaks seal instantly, but some can take additional thermocycles which happen over a few days of usage.

Buy Online:

Available at:


  • Professional-grade, easy-to-use head gasket solution
  • Strongest antifreeze-compatible solution on the market

A PTEN Top 100 Award-winning Product for 2016

When you think about a blown head gasket, do you see your money being spent at the repair shop? How much time and inconvenience is involved in taking your car to a mechanic for blown head gasket repair? The lost time is a frustration, and the money it takes to alleviate a head gasket leak is overwhelming. That’s because fixing a head gasket can cost you quite a bit (typically $1,500-$3,000). We know you would rather spend that money on the things that matter most. That’s why we created this professional-grade, easy-to-use head gasket solution. It’ll repair your leaking head gasket and save you money.

Bar’s Leaks Professional Carbon Fiber Blown Head Gasket Repair is the strongest antifreeze-compatible solution on the market, period. It penetrates a leaking, damaged or blown head gasket, drying to form a seal that’s actually stronger than the original head gasket itself. It’s the best formula to stop all other coolant leaks in plastic, cast iron, copper and aluminum radiators, heater cores, freeze plugs, gaskets, intake manifolds, cylinder heads and engine blocks. The special formulation also contains Xtreme Cool™, which stops overheating and reduces water temperature. Our fast, effective head gasket sealer is the result of decades of research and testing by top-flight chemical engineers. When you choose Bar’s Leaks for blown head gasket repair, you’ve got a product that’s designed to fit perfectly into the lifestyle and budget of everyday drivers.

A physical blown head gasket repair can be expensive, which is why Bar’s Leaks is proud to offer an affordable solution for your head gasket leak. And best of all, you don’t need any automotive expertise to install our head gasket sealer. If you know how to open the hood of your car, you can use this blown head gasket repair product.

Bar’s Leaks Professional Series – the products used by techs nationwide. Go grab yourself a bottle so you can spend your money on the things that matter. It’s time to get your show back on the road. Don’t let a blown head gasket sideline your life – or your wallet.


Customer Reviews

  75 Reviews
Submit your review

Create your own review

Average rating:  
 75 reviews
 by Andy
Saved my truck 600 miles from home

Head gasket blew on my 2006 Tundra while I was 600 miles from home. Luckily I was in a parking lot and didn't have to move it for a day or so. Local mechanic couldn't look at it for 4 more days and estimated it would take several days after that to replace the head gasket. Found Head Seal online and thought I'd give it try since I had nothing to lose. I bought it at AutoZone the next day and followed the instructions to the letter. Couldn't pour the whole bottle into my radiator so I was a little worried it wouldn't seal. After a day of light driving around town and checking the coolant level every 30 mins, I decided I would try driving 600 miles home. Every hour I pulled over at a gas station and again checked the coolant level and nothing changed. Coolant temp was constant the entire trip. Can't believe Head Seal is pure magic.

 by Daryl
Blown head gasket

I was out of town when truck overheated so I pulled over to assess the issue when I realized I had a blown head gasket. Needless to say money signs was all I could see. Just knowing I was out of town with a broke down truck and not really any time available for me not to have my truck, I started calling around for prices to fix the blown head gasket I got quotes from $2000 to 4500 to fix the blown head gasket in my truck.

I never have heard about Bar's Leaks Head Gasket Repair as I was very skeptical about paying $60 for a bottle because as you all know most of the time stuff like that just don't work. So I took a gamble and purchased Bar's Leaks Head Gasket Repair, did everything the bottle said to do, and then went for a test drive and my truck overheated again so I redid the steps as bottle noted and then test drove again.

I have not leaked one drop of fluid out of my radiator since that was 4000 miles ago and truck is still running strong as it should. Needless to say I was very, very impressed and I still am so thanks to all of you who have come together to invent something this strong that really works and continues to work. Again I would recommend it immediately for any kind of coolant leak it really, really works. Thanks Bar's, you save cars.

 by Russ S.
Amazing product

Thanks for your amazing products. My Honda 2002 Accord I purchased had a blown head gasket. I used the head gasket repair (Bar's Leaks HG-1)
It worked for over 2000 miles until I could afford a full fix. A great temporary repair. Thank you.

 by Hitoshi O.
My mechanic used it

My mechanic used HEAD SEAL BLOWN HEAD GASKET REPAIR Professional to stop Head Gasket Leak. It is working!. Eventually, I might still need to install a new head gasket, but right now I'm back on the road.

 by Dennis W.
Worked for me!

Since I had a really bad leak, the second dose of HG-1 that I used sealed the head, and I left it in this time. I was willing to gamble on it not clogging the cooling system because I saw several videos and reviews by fans stating HG-1 is the best sealant on the market and safe to leave in. Worked for me.

 by John M.
Saved my son's BMW from wrecking yard

Thank you!

I failed to tell my son not to drive up a mountain with the air conditioner on in the summertime, while speeding. Shocker...he had a major issue!

We used this, it WORKED...

as in, worked as advertised...

I'm taken aback, and very pleased!

The old girl (1998 BMW 528I 170,000 + miles) has never felt better under our care.

Feels like she has 100K less.

Thank you, again. Saved her from the auto wrecking yard!

 by Robert Z.
Used in three cars, worked in all of them!

I used Head Seal Blown Head Gasket Repair on three cars this year. All three had high miles and were in ok condition but not worth a new engine or the high cost to repair. 200,000 miles is a risky bet to take the engine apart.   

In all three cases the leak was sealed, and they are all running fine! 

If they fail we can still decide to fix but for now we don't have to!

 by Edwin A.
Thank you for giving my daughter an additional 3 years with her car

I used the Blown Head Gasket Repair (HG-1) on my daughter’s 2003 Honda CRV with a blown head gasket. Before I used your product her vehicle would overheat within 10 mins of the engine being on. After using your product, it no longer would overheat, and she was able to use her vehicle for an additional 3 years before crashing it beyond repair. Thank you for the additional years she was able to enjoy her first car!

 by Gabriela V.
Product does exactly what it promises

I have a 2001 Ford Expedition and was having issues with a blown head gasket. I took the vehicle to several shops, and most told me it would be too costly to repair. I was better off just selling SUV and letting buyers know the car had a head gasket problem. If I wanted to fix it instead, I was looking into paying over $1000. I instead went to AutoZone and asked for something to use temporarily until could come up with the money to fix it since I could not afford to purchase another vehicle. AutoZone recommended Blown Head Gasket Repair HG-1. To my surprise, it has been well over 1 year and the car is running well and has no problems. I am super happy with this product and highly recommend it. Family and friends are super surprised at how this product does exactly what it promises. Thank you :)

 by Bryan E.
Still holding up after 20K miles in over 100 degree heat

I rebuilt the 3.0 SOHC engine in my ‘92 Dodge Stealth. My machine shop did not pay attention to the mill limit specs on the engine type and over milled the deck of the block. When I installed the pistons, they were sticking out of the block. I had 3 choices, custom pistons and rebalance the engine, find a good block for an engine that is already hard to find, or install head saver shims. I went with the head saver shims. If you haven’t used them, they are basically flat steel plates that seal to the block with hylomar sealant and the head side gets a head gasket. Yes a band aid but it is not a race car. 

I knew the shims were a sketchy fix and at less than 15K on the motor the lower radiator hose came loose in the snow. The car overheated and I developed a small head gasket leak. Not even enough to cause an overheating problem but it was a slow and steady stream of bubbles coming up at the radiator cap. About 1 per second or 2 but steady and non-stop. It was a premonition of bad days ahead. 

I opted for your Bar's Leaks Head Gasket Repair because your Bar's Leaks Liquid Copper kept my ‘73 Challenger alive. It had multiple holes in the radiator and with regular infusions of the magic powder it ran great for almost 2 years before I could finally afford a radiator. 

I followed the instructions to the T and the leak stopped but I developed another problem. The stop leak stopped up my radiator cap. It would build up too much pressure when hot and when cooled off it would not suck coolant out of the reservoir, instead it collapsed all the hoses. I replaced the cap and within a few days the same problem. The good news was the head gasket was fine, the new hoses installed at the rebuild were fine, but the new water pump gave up the ghost. 

When I replaced the water pump I did not flush the system. I just left the remainder of the stop leak in the system hiding the usual places. 

Since then I still see small amounts of the silver particles in the coolant, but not in the quantity I had before the water pump replacement. I have had no overheating problems, and the radiator caps do not clog anymore. It has been over 20K miles and much in over 100 degree heat, still holding up. Knock on simulated wood grain shift knob. LOL 

I will use it again on other engines, but I may drain some out after I get the leak under control.

Bar's Leaks response: Hey Bryan! Thanks for your incredibly thoughtful and detailed review! We appreciate you! Thanks for being a longtime Bar's Leaks customer. 👍

Page 1 of 8:

FAQ (click or touch to expand)

Product Videos

SDS/Technical Info

Product Data SheetOpen