Performance Head Gasket Sealers That Actually Work

Thermagasket Plus: The Complete Line of Performance Head Gasket Sealers

At RX Auto, we manufacture a full line of performance head gasket sealers engineered to repair blown head gaskets, cracked cylinder heads, and cooling system failures—quickly, safely, and permanently. Our industry-leading product line, Thermagasket Plus, includes head & block sealants, cooling system cleaners, and complete repair kits designed for full-system treatment and long-term results.

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Why Thermagasket Plus?

Designed for Performance Repairs

Each product in the Thermagasket Plus system is formulated for high-pressure, high-temperature sealing across gasoline, diesel, and hybrid applications.

Full-System Chemical Treatment

Not just a quick fix—Thermagasket Plus includes:

  • Seals cracks and gasket failures
  • Pre-treatment for maximum bonding
  • Bundled systems for complete engine restoration

Engine Compatibility You Can Trust

Compatible with most vehicle types, including Cadillac Northstar, Subaru, Jeep, Ford, GM, Toyota, and more.

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Thermagasket Plus Product Line

Explore RX Auto’s complete line of head gasket repair chemicals, engineered to solve everything from minor coolant leaks to severe gasket failures. Each product in the Thermagasket Plus lineup is designed to work independently or as part of a full-system solution—delivering professional-grade results with every use. Whether you need a powerful performance head gasket sealer, a system cleaner, or a specialized engine kit, Thermagasket Plus has the right formula for the job.

How Thermagasket Plus Works

Unlike basic products that mask symptoms, our performance head gasket sealers follow a science-backed, three-stage process:

Clean the system with RX Auto’s Cooling System Cleaner

Apply Thermagasket Plus for deep chemical bonding

Continue with proper coolant and temperature control

What is a Head Gasket?

The head gasket is a long flat metal piece with large holes that lives between the engine block and cylinder head. It seals the combustion chamber and allows your car to build and maintain proper compression while containing exhaust gases in order to protect your engine’s efficiency. The head gasket also prevents coolant and oil from getting into the combustion chamber and inside the correct cylinders.

Engine Compatibility You Can Trust

When it comes to head gasket repair, compatibility matters. Thermagasket Plus is engineered to work across a wide range of engines and cooling system designs—making it a trusted solution for both domestic and import vehicles.

Whether you're working on a modern hybrid or a high-mileage classic, our formulas are tested and trusted on:

Cadillac Northstar

Subaru

Jeep

Chrysler

BMW

Audi

Ford

GM/Chevrolet

Toyota

Honda

Nissan

and other domestic and import vehicles

No matter the make or model, RX Auto’s performance head gasket sealers deliver the reliability you need.

Free returns

Returns within 30 days receive a full refund.

Wordwide shipping

Ship anywhere, rates available at checkout.

Sales Support

Call us anytime at 1(925) 215-1211.