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PERFORMANCE HEAD GASKET REPAIR THAT ACTUALLY WORKS

Manufactured to U.S. Quality Standards MADE IN THE USA
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  • Thermagasket Head and Block Treatment Kit

    Thermagasket Head and Block Treatment Kit

    Thermagasket Head and Block Treatment Kit

    $79.95
    $79.95
  • Cadillac Northstar Repair Kit

    Cadillac Northstar Repair Kit

    Sale

    Cadillac Northstar Repair Kit

    $189.95
    $299.95 $189.95
    Sale
  • Thermagasket For Hybrid Vehicles

    Thermagasket For Hybrid Vehicles

    Sale

    Thermagasket For Hybrid Vehicles

    $49.95
    $60.99 $49.95
    Sale
  • Thermagasket Defender

    Thermagasket Defender

    Sale

    Thermagasket Defender

    $49.95
    $58.90 $49.95
    Sale

Who are We?

The Complete Line of Performance Head Gasket Sealers

Thermagasket Plus is an automotive chemical engineering company specializing in high-performance solutions for engine repair and cooling system restoration. With over a decade of hands-on field testing and formula refinement, we've helped thousands of vehicle owners, mechanics, and service shops solve complex engine problems quickly, safely, and affordably.

Find the Right Solution

SAVE THE ENGINE. SKIP THE MASSIVE REPAIR BILL.

thermagasket-a2b9

Cadillac Northstar Repair Kit

$189.95
$299.95 $189.95
Sale Sold out
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What the product is

Thermagasket Plus is RX Auto’s line of performance head gasket repair solutions, including sealants, cooling system cleaners, and complete treatment kits designed for full-system engine repair and restoration.

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thermagasket-a2b9

Thermagasket Head and Block Treatment Kit

$79.95
$79.95
Sale Sold out
View full details

Designed for Performance Repairs

Why Thermagasket Plus?

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, includingCadillac Northstar, Subaru, Jeep, Ford, GM, Toyota, and more.

Thermagasket Plus Product Line

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

What is a Head Gasket?

The head gasket is a metal seal between the engine block and cylinder head that keeps compression strong, contains exhaust gases, and prevents oil and coolant from leaking into the combustion chamber.

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Over a decade of field testing and formula refinement

Chat with a trained technician

Over a decade of field testing and formula refinement

Chat with a trained technician

Over a decade of field testing and formula refinement

Chat with a trained technician

Over a decade of field testing and formula refinement

Chat with a trained technician

Over a decade of field testing and formula refinement

Chat with a trained technician

Over a decade of field testing and formula refinement

Chat with a trained technician

Over a decade of field testing and formula refinement

Chat with a trained technician

Over a decade of field testing and formula refinement

Chat with a trained technician

Over a decade of field testing and formula refinement

Chat with a trained technician

  • Money-Back Guarantee

  • Works on Gas, Diesel & Hybrid

  • DIY & Professional Use

what our customers say about us

4.9

Based on 3250 Reviews

Travis Wills July 2025
Verified Buyer
RX Delivered
RX Auto delivered exactly what I needed. Easy to use, clear instructions, and a noticeable improvement in engine performance. Great for head gasket and cooling system issues.
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RX Auto’s head gasket sealers deliver reliable results for any make or model.

Chat with a trained technician

RX Auto’s head gasket sealers deliver reliable results for any make or model.

Chat with a trained technician

RX Auto’s head gasket sealers deliver reliable results for any make or model.

Chat with a trained technician

RX Auto’s head gasket sealers deliver reliable results for any make or model.

Chat with a trained technician

RX Auto’s head gasket sealers deliver reliable results for any make or model.

Chat with a trained technician

RX Auto’s head gasket sealers deliver reliable results for any make or model.

Chat with a trained technician

RX Auto’s head gasket sealers deliver reliable results for any make or model.

Chat with a trained technician

RX Auto’s head gasket sealers deliver reliable results for any make or model.

Chat with a trained technician

RX Auto’s head gasket sealers deliver reliable results for any make or model.

Chat with a trained technician