How to Use the Thermagasket Set

The Thermagasket Plus Head and Block Treatment Set is a complete chemical system designed to repair blown head gaskets, cracked cylinder heads, and minor block damage. It includes everything needed to clean, treat, and seal your engine’s cooling and combustion pathways using RX Auto’s proven formula. Whether you're a professional mechanic or a confident DIYer, following each step precisely is key to achieving a strong, lasting seal.

This treatment is ideal for engines experiencing symptoms like overheating, coolant loss, white exhaust smoke, or combustion gases in the cooling system. It’s compatible with gasoline, diesel, and hybrid engines—including known problem platforms such as Cadillac Northstar, Subaru, and Jeep. In this guide, we’ll walk you through the full process: system prep, chemical application, engine cycling, and final flush. Done correctly, the Thermagasket Plus Head and Block Treatment Set restores performance, protects engine integrity, and gets you confidently back on the road.

The Thermagasket Treatment Process is Completed in 4 Easy Steps

Thermagasket can protect against cylinder compression and back pressure. There is no need to locate the cylinder that is causing the bubbling in the overflow tank or radiator.

Instructions

  1. Flush the cooling system with clean water.
  2. Add parts A and B of the Thermagasket Head and Block Treatment to the cooling system, top off the system with clean water, and replace the cap.
  3. Run the vehicle at operating temperature.
    1. If your vehicle is steaming, it will stop, usually within a few minutes of the vehicle reaching operating temperature.
    2. Water will stop getting into your oil and or cooling system
    3. If your vehicle is overheating because of the breached head gasket it will stop
  4. Once repaired, flush the cooling system and replace water & antifreeze/coolant
    CARS- 100 EFFECTIVE

    Thermagasket Head and Block Treatment Kit

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    • Description
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    • Info

    Thermagasket is 2-part, Ceramic Fiber, Elemental Carbon and Iron Metallic Alloy compound. EFFECTIVELY Seals Blown Head Gaskets, Cracked Heads and or Blocks in all aluminum, steel, and cast iron engines. We will refund your money if we are not able to successfully help you with the repair. Thermagasket is the most effective blown head gasket repair on the market today! 100% effective. All orders ship within 24 hours.

    • Seals your head gasket in less than 10 minutes!
    • No Mechanic Needed. Do It Yourself!
    • Save Thousands Over Conventional Repairs
    • Developed by Automobile and Chemistry Experts

    16 oz Part A Base
    8 oz Part B Catalyst

    CARS- 100 EFFECTIVE

    Solves the following problems:

    • Failing or completely failed head gasket
    • Warped heads
    • Cracked engine blocks and heads
    • Coolant leaks between the head and block
    • Intake manifold coolant leaks
    • Overheating due to a cracked head or block
    • Oil leaks into the cooling system (radiator)
    • Coolant leaks into the oil
    • Excessive steam and water from the tailpipe

    Most head gasket failures are caused by engine overheating. If you’re not sure why your engine overheated, review a shortlist of the most common causes below.

    Sudden Overheating:

    • Defective Thermostat
    • Defective Electric or Clutch Type Cooling Fan
    • Cooling System Leak

    Recurring Overheating:

    • Defective Radiator Cap – not maintaining proper pressure in the cooling system
    • Defective Electric or Clutch Type Cooling Fan
    • Plugged Radiator or Heater Core
    • Sticking Thermostat
    • Cooling System Leak

    What is a blown head gasket?

    A blown head gasket is a breach in the gasket whose purpose is to form a gas-tight seal between the cylinder head and the engine block. This type of breach typically occurs in cars that have severely overheated. During severe overheating, the head or block warps, causing it to pull away from the gasket. The unsupported gasket fails under the high pressure of combustion or heat from the cooling system. Once the gasket is penetrated, exhaust gases escape from the cylinders into water cooling ports and often into adjacent oil ports. When this occurs, the cooling system malfunctions, resulting in the engine overheating.

    What are the symptoms of a blown head gasket?

    The most visible sign of a blown head gasket is steam visible from the tailpipe after the car has warmed up. However, many cars with minor damage to the head gasket don’t show any visual indicators. In this case, the cooling system must be checked for the presence of exhaust gases.

    Another symptom frequently encountered is the presence of water in the oil. It appears as a milky white emulsion under the oil cap and on the dipstick.

    How does Thermagasket work?

    Whenever there is a breach in the head gasket, a cracked head, or a cracked block, a hot spot develops at the point of the breach. That hot spot can reach temperatures 3 to 4 times that of normal engine operating temperatures. When Thermagasket comes into contact with this superheated area, it instantly forms a perfect high-temperature seal. Once Thermagasket’s metallic alloys seal the breach, heat is deflected away from the patch, eliminating the hot spot and preserving the long term integrity of the repair.

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