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Our repair process is much different and faster than any other manufacturer. The steps are simple. (No need to remove the thermostat)

  1. Prepare the coolant system by flushing it out with plain water.
  2. Pour in the Thermalweld.
  3. Run the engine at 3,000 RPM’s for approximately 10 minutes. Usually, it takes less than 10 minutes to repair the head gasket.
  4. After the repair, the head gasket will be sealed but not fully cured. To fully cure the seal, drive normally at least 4 times in the 1st 3 days. The more the better.

Watch the videos below to see how fast it takes to repair a head gasket.

(3 customer reviews)


Watch how fast THERMALWELD repairs a head gasket!

2 Minute 20 Second Repair 1:27

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1 Minute 7 Second Repair  1:20

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2 Minute 31 Second Repair 1:11

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5 Minute Repair:34

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By running the engine at high RPM’s, thin layers of the solution are passed through the hole in the head gasket. The thin layers eventually build up until the breach is completely sealed.





A Technical Support / Mobile Technician can help analyze and give advice for your particular situation. After receiving the repair solution, if any questions arise, call for Technical Support (844) 796-7968. We take responsibility for the repair. We will be here before, during, and after the repair.




M–F 6:00 am to 5:00 pm PST / Sat. 6:00 am to 12:00 pm PST

(844) 796-7968, ex. 1 or ex. 2.



M–F 7:00 am to 5:00 pm PST / Sat. 7:00 am to 12:00 pm PST

(844) 796-7968, ex. 3



M–F 8:00 am to 4:00 pm PST / Closed Sat.

(844) 796-7968, ex. 4

Additional information

Select Your Engine Size

4 Cylinder, $99, 6 Cylinder, $109, 8 Cylinder, $119, Hybrid, $99, Cadillac Northstar Kit, $250, Medium-capacity Diesel (10-20 gal), $149, Large-capacity Diesel (20 gal and over), $189

3 reviews for THERMALWELD

  1. John

    North Star Head Gasket Repair
    Make:Cadillac Model:Deville Year:2001

    Hey. I’m John and I was looking at round $4000 in repairs til I found thermalweld. This is the real deal. I’ve tried the other liquid fixes, but this stuff is amazing. If you are gonna use a head gasket sealer, use this. No leaks, no overheating anymore and worth it’s weight in value. I will back this product up 1000%. Try it you won’t be disappointed. Thank you Thermalweld and Mr.Robert my personal technician.

  2. Anonymous

    Caller: (575) 741-6***
    Extension: 5 – Reviews
    Grasshopper #: (844) 796-7968
    Timestamp 10/14/2018 1:17 PM Pacific Daylight Time

    Yes I would like to thank you very much for all the great service you gave me. My car is running great. Thank you very much Goodbye.

  3. Anonymous

    Make: Cadillac

    Caller: (310) 920-9***
    Extension: 5 – Reviews
    Grasshopper #: (844) 796-7968
    Timestamp 9/16/2018 1:37 PM Pacific Daylight Time

    Hey my name is Van. I got great service from Dave. I’ve had eight Cadillacs and I’m on 8th one and I thought I was gonna have to get rid of it when the head gasket went. I found Dave on Craigslist. He came to fix the thing in an hour and a half and I’ve driven it 2000 miles since with the AC on it’s awesome. I can’t believe I didn’t use the service early I didn’t know about it because my other caddys head gaskets would always go and I would be totally screwed. So Dave for a very small price saved me from having to get a whole new car or $3000 engine swap out at any rate I will refer people to you guys you guys are really professional your product is great and and it’s it’s it’s been it’s been a real life saver. Thank you.

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