If you use Thermalweld as directed and it does not repair your head gasket then we will refund 100% of your purchase price.

Thermalweld is designed to work with all water cooled internal combustion engines. (Automobiles, trucks, boats, motorcycles and other consumer and industrial equipment; gas, diesel)

Thermalweld is designed for aggressive use for a limited period of time and then removed. If the treatment is left in a stagnant cooling system for a long period of time then some clogging may occur. However, if the instructions are followed then Thermalweld will NOT clog any part of the cooling system.

Thermalweld will not hurt your engine in any way if the directions are accurately followed.

The repair should last until the engine overheats again. Typically, the cooling system is the least maintained system on a vehicle. If the cooling system is maintained the repair should last for years.

DO NOT mix Thermalweld with antifreeze.

If the cooling system has been properly restored to factory specifications, Thermalweld will:

• Repair failed or failing head gaskets,
• Stop overheating due to a failed head gasket,
• Stop coolant loss through the head gasket,
• Stop leaks in water cooled intake manifolds,
• Stop steam and water from spewing out the exhaust pipe.

Yes. Thermalweld sells a special kit that fixes the cooling system problem that all North Star Cadillacs have. The kit includes the Thermalweld chemical treatment and hardware components required to make an important cooling system modification. This kit will repair virtually every North Star Cadillac that still has a functioning engine.

A head gasket fails when a gap opens up between the gasket and the adjoining metal support surface. This usually happens when the engine overheats from some cooling system compenent failure - like a stuck thermostat or coolant leak. Excessive heat causes metal heads and blocks to expand, warping the head gasket support surface. When this happens, the hot combustion gasses inside the cylinders easily cut through the gasket. When the gasket fails, hot gasses escape into the cooling system causing the engine to further overheat.

Once the initial overheating problems are repaired, the same process that created the gap in the head gasket is used to repair it using Thermalweld. As the pressure inside the cyclinders go up and down, cooling system fluid containing Thermalweld is drawn through the head gasket gap and fused to the gasket. The cycle is repeated until the gap is completely filled. This happens in a very short period of time, usually around ten minutes.

Thermalweld has been repairing head gaskets for over a decade. It is easy to use, fast to act, and amazingly reliable. We guarantee it or your money back.

Call Thermalweld Technical Support (877-220-9944) to find out if your problem can be repaired using the Thermalweld process.

1997 The original Thermalweld formula was discovered by accident while conducting research on high temperature, fire proof coatings. That chemical formula started being used on a regular basis to fix friends’ and neighbors’ vehicles. It wasn’t long before it became apparent that there was a profitable business in the low-cost repair of damaged head gaskets.

2002 People around the inventor began to realize that there was good money to be made in the head gasket repair business. Many of the customers that had their cars repaired by the Thermalweld chemical treatment wanted to start repairing head gaskets too. The concept of training and certifying professional technicians to use the chemical for their own mobile head gasket repair business began to develop. In a short period of time the mobil head gasket repair business rapidly grew into a nation-wide network of over 100 Thermalweld Technicians. After that, people all over the globe started wanting to become Thermalweld Technicians too.

2005 Thermalweld Marketing Inc. was created to handle Thermalweld product distribution. One of the top Thermalweld Technicians decided to market Thermalweld over the internet as a 2-part process. For the first time large numbers of people began to realize that a head gasket repair treatment could permanently repair their blown head gaskets and save them serious money in the process. Product sales skyrocketed and remain strong.

2011 Thermalweld Marketing Inc, whom had always focused on Technicians and OEM sales, decided to start selling the Thermalweld product under the manufacturers’ own brand name. That professional-grade product is now for sale on this site under its original name - Thermalweld.

No, it has no effect on head removal. Removing a head that has been repaired with Thermalweld is interesting because you can actually see how it works. It’s really amazing.

That depends... Thermalweld does repair the portion of the head gasket that isolates the combustion chambers, oil passages and cooling system. Oil can leak into the coolant when the head gasket fails but usually this is not visible from outside the engine.

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Yes, we regularly ship to Canada. For all other international locations call Thermalweld Technical Support for special shipping instruction.

We ship your order within 24 hours and use US Express Mail that typically provides 2 day delivery anywhere in the continental US.