Updated at: 15-07-2022 - By: Lucas

What is exhaust sealant good for?

You can use the exhaust sealant to fix your car’s exhaust pipes without having to remove them. This is due to the harsh conditions in which it operates, such as continuous temperature variations and exposure to dangerous compounds directly in the exhaust gas.

This area is filled with condensate, which will cause the rust to form.

Why do exhaust elements wear out?

Exhaust Sealant

Impurities or dirt that enters the exhaust system will wear down the exhaust system’s material, causing it to fail

  • Frequent temperature changes at which the exhaust is operating, especially if you drive short distances in the cold season.
  • Low-quality material of the exhaust pipes or other parts of it
  • Burnout of pipes, muffler, or other parts;
  • Mechanical damage to the exhaust elements. For example, driving on a bad road.

Repairing the exhaust system elements

In order to repair damaged exhaust pipes, you can solder them back together or use a specific sealant that accomplishes the same result without having to remove the exhaust components from the vehicle.

The sound they make is often compared to the sound of a race vehicle, which makes it easier to identify their damage.

When to use the exhaust system sealant

Heat-resistant ceramic or elastic sealants are used to ensure the system is completely leak-proof. A sealant’s operating temperature, performance attributes, convenience of use and durability are all factors to consider when selecting a repair sealant.

In the majority of cases, an exhaust system sealant is employed.

  • To cover cracks on the exhaust elements
  • When repairing a muffler to cover cracks, or when, if a metal patch is used to repair the muffler, then in addition to the fasteners, it must also be mounted with a sealant.
  • Elements of the new exhaust system.

How to choose the best exhaust system sealant


Because there are so many sealants on the market today, it’s important to read the product description carefully and keep the following things in mind:

Sealant type

Silicone and ceramic are the most common building blocks for exhaust sealants. In comparison to ceramic sealant, silicone sealant remains slightly mobile after hardening and does not lose its qualities due to vibration or small shifts in the parts it is applied to. Exhaust system parts are joined together using these when gaskets are employed.

After hardening, ceramic sealants can be used to plug big cracks or holes caused by rust. They are typically employed for this purpose. You can get them in the shape of paste or cement at your local supermarket. Their drawback is that vibrations can cause them to break.

As a result, you should use a silicon-based sealer instead of cement for minor repairs.

Each variety of sealant has its own unique appearance, properties, and uses.

  • Cement. Used for difficult repairs, this type can be used to repair only fixed parts, muffler housings, resonator, as well as for processing joints. As a disadvantage, it dries very quickly when exposed to high temperatures.
  • Adhesive for repairing exhaust elements. Being made on the basis of fiberglass and extra additives, these products are intended for sealing small holes and/or cracks in the exhaust pipe and other parts. As for advantages, it solidifies in about 10 minutes and is resistant to thermal changes, but under mechanical stress, it can crack.
  • Muffler sealant. Used both as a prophylactic and repair agent, it is based on silicon with other additives. Silicone sealant can be used directly in muffler, pipes, resonator, exhaust manifold
  • Mounting paste. It is usually used when installing new parts or when repairing and installing used ones. Influenced by high temperatures, the paste quickly hardens and keeps its good properties for a long time.

Alternatives to sealants

Heated body wraps; In addition to being an excellent substitute for standard sealants, it can be used to repair tears and cracks and does an excellent job of doing so.

Temperature working range

Higher temperatures are a good sign, but they aren’t the only one that matter. This would logically imply that the sealant’s functioning characteristics would be maintained at high temperatures, but this is not totally accurate. If the sealant’s maximum temperature is stated for a short period of time, it is misleading to consumers. A higher value is expected.

This means that in addition to looking at the highest permissible temperature, you must also consider how long the sealant can withstand this temperature for.

Tips for repairing the exhaust with sealant

Sealant can be used as a temporary fix or to repair minor exhaust system damage. Significant damage, such as larger decayed holes, necessitates the replacement of the element.

  • Before using the sealant, you should clean the area on the exhaust of debris, rust, moisture, and dirt. Ideally, you should also degrease the area, since not all sealants are resistant to oil.
  • The sealant should be applied evenly. The paste for the exhaust system squeezed out from under the adjoining surfaces must be carefully removed.
  • The sealant usually hardens for at least one to three hours at a normal temperature. The exact information is written in the instructions.

When it comes to exhaust sealant, Permatex, one of the best brands on the market, is a terrific choice. As a paste, it can withstand temperatures up to 2000 degrees Fahrenheit (1000 degrees Celsius). It’s also water-resistant and shock-resistant. In addition to tailpipes, it can also be used on mufflers, joints, and even catalysts.

The cleaned and water-moistened surface is prepped for the sealant application. When you’re done applying the product, wait 30 minutes before starting the engine at idle speed.

J B Weld is a good exhaust sealant, too. When exposed to dampness and extreme temperatures, this material remains durable. It can be applied to a variety of different things.

Exhaust parts that require more extensive repairs should be replaced by Yale.

FiberFix is a great alternative to sealant because it’s quick to apply, doesn’t leave a mess, and does a great job of covering cracks and small holes. Tolerates high temperature and sets in one hour.