About Us

Thermalweld’s History of 23 Years in the Business

Thermalweld History


Thermalweld was invented by chemist Robert Hooper.


Extensive field tests were conducted at auto salvage yards and in the field.

What we learned:

  1. Head gasket damage can be from minor to very severe.
  2. Not all head gaskets can be chemically repaired.
  3. Understanding and addressing the engine overheating problem is vital.


Established a Thermalweld mobile head gasket repair service.
(From 1997 to 2018, repaired over 1500 vehicles in the field.)


RX Auto introduced Thermalweld to the retail market under the private label Thermagasket.


Contracted to manufacture and provide technical support for RX Auto Thermagasket online sales.

Under the private label Thermagasket, authorized, trained, and supported over 100 mobile technicians nationwide.


No longer provided technical support or manufacturing for Thermagasket.

2011–February 2018

Contracted to provide technical support for Steel Seal LTD.

Established the Cadillac Northstar Division. Thermalweld was private labeled as Steel Seal Elite for the Cadillac Division.

Improved the formula for better results.

In 2014 began providing Steel Seal Elite as a retreatment if the original Steel Seal formula failed.

February 2018–Present

No longer providing Steel Seal technical support or retreatments.

Closed down Steel Seal’s Cadillac Northstar Division.

Rebranded Steel Seal Elite back to Thermalweld.

With 23 years of knowledge and experience, Thermalweld continues to provide the best repair solution and technical support in the industry.

We supervise each repair from start to finish, so you don’t have to worry if you’re doing it right.


Satisfaction Guaranteed