muffler sealant

muffler sealant allows without dismantling to repair the elements of the exhaust system in case of damage. These products are heat-resistant ceramic or elastic sealants that ensure the tightness of the system. When choosing one or another sealant for muffler repair, you need to pay attention to its performance characteristics - maximum operating temperature, state of aggregation, ease of use, durability, warranty period of use, etc.

Domestic and foreign drivers use a number of popular sealants for the car exhaust system. This material provides a brief overview of the most popular and effective sealants with a description of their work, as well as an indication of the packaging volume and the current price.

The name of the most popular sealant from the line	Brief description and features	The volume of sold packaging, ml/mg	The price of one package as of the summer of 2019, Russian rubles
Liqui Moly exhaust repair paste	Exhaust system repair paste. The maximum temperature is +700°C, it has no smell. Works great in practice.	200	420
Done Deal Ceramic Sealant	Great for both repair and installation work. Increases the life of the exhaust system by 1,5 ... 2 years. Very dense and thick. Of the shortcomings, only fast polymerization can be noted, which is not always convenient to use.	170	230
CRC Exhaust Repair Gum	Adhesive lubricant for the repair of exhaust systems. Used to repair cracks and holes in the exhaust system. The maximum temperature is +1000°С. With the engine turned on, it freezes in 10 minutes.	200	420
Permatex Muffler Tailpipe Sealer	Sealant for muffler and exhaust system. Does not shrink after installation. With the help of the tool, you can repair mufflers, resonators, expansion tanks, catalysts. The maximum temperature is +1093°С. Provides high tightness.	87	200
I OPEN ES-332	Repair cement muffler, resonator, exhaust pipes and other similar items. The maximum allowable temperature is +1100°C. With the engine turned on, it freezes in 20 minutes.	170	270
bosal	Sealant cement for exhaust systems. Can be used as a repair and assembly tool. It freezes very quickly, which is not always convenient.	190	360
Holt Gun Gum Paste	Paste sealant for the repair of mufflers and exhaust pipes. Can be used on a variety of vehicles.	200	170

Why muffler sealants are needed

The elements of the exhaust system of a car operate in very harsh conditions - constant temperature changes, moisture and dirt, exposure to harmful substances that are in the exhaust gases. Condensation gradually accumulates inside the muffler, which causes it to rust. This is a natural process leading to the destruction of the exhaust pipe or resonator. However, there are a number of emergency reasons for which a similar action occurs.

Reasons for repairing the exhaust system

The following processes affect the damage to the elements of the exhaust system:

• burnouts of pipes, resonator, muffler or other parts;
• chemical corrosion of metal due to exposure to low-quality fuel vapors, chemical elements that process the road, road bitumen and other harmful elements;
• low-quality metal from which the muffler or other mentioned parts of the system are made;
• frequent temperature changes at which the car and the exhaust system are operated, namely (especially important for frequent, but short trips during the cold season);
• mechanical damage to the muffler or other parts of the system (for example, due to driving on rough roads);
• incorrect and / or poor-quality assembly of the exhaust system of the car, due to which it works with increased intensity.

The reasons listed above contribute to the fact that over time, the car exhaust system depressurizes, and exhaust gases come out of it, and moisture and dirt get inside. As a result, we have not only further destruction of the entire exhaust system, but also a decrease in the power of the car. Since, in addition to the fact that the elements dampen sound waves, they remove exhaust gases from the internal combustion engine.

Exhaust system repair can be carried out in two ways - using welding, as well as muffler repair without welding. It is for repair without dismantling that the mentioned sealant is intended.

Where and how is muffler sealant used?

In most cases, the following details are processed using this tool:

• Elements of a new exhaust system. namely, the joints of the inner annular surfaces of parts, pipes, flanges. In this case, the thickness of the sealant layer can be different, up to 5 mm.
• Sealing elements of an existing exhaust system. Similarly, the joints where exhaust gases leak, flange connections, and so on.
• Muffler repair. It is used here for three purposes. The first is when cracks / cracks appear on the muffler body. The second - if a metal patch is used to repair the muffler, then in addition to the fasteners, it must also be mounted with a sealant. Third - in a similar situation, self-tapping screws (or other fasteners, such as rivets), which are used to mount the patch on the muffler body, must be treated with sealant.

Tips for using heat resistant muffler repair glue:

• Before applying the sealant to the surface to be treated, it must be thoroughly cleaned of debris, rust, moisture. Ideally, you also need to degrease (it is better to clarify this nuance in the instructions, since not all sealants are resistant to oil).
• Sealant should be applied in an even layer, but without frills. The exhaust system paste squeezed out from under the component surfaces must be carefully removed (or smeared on the side surfaces to ensure greater tightness).
• Muffler sealant usually cures for a minimum of one to three hours at normal temperature. The exact information is written in the instructions.
• Sealant should only be used as a temporary measure or to repair minor damage to exhaust system components. In case of significant damage (large rotten holes), it is necessary to change the element.

An excellent use of sealant is the prevention and assembly of elements of a new system.

What are the criteria for choosing a sealant for a muffler

Despite all the variety of sealants for car mufflers presented in stores, you should not buy the first one that catches your eye! First you need to carefully read its description, and only then make a decision on the purchase. So, when choosing one or a sealant, you need to pay attention to the following reasons.

Temperature operating range

This is one of the most important indicators. Theoretically, the higher the maximum allowable operating temperature, the better. This means that the sealant, even with prolonged use and high temperatures, will not lose its properties for a long time. However, in reality this is not entirely true. Many manufacturers deliberately mislead consumers by indicating the maximum allowable temperature, which the sealant can handle only for a short time. Naturally, this value will be higher. Therefore, you need to look not only at the maximum allowable temperature value, but also at the time that the sealant is calculated at this temperature.

State of aggregation

namely, heat-resistant muffler and exhaust pipe sealants are divided into silicone and ceramic.

Silicone sealant after hardening, it remains slightly mobile, and does not lose its properties during vibration or small shifts of the machined parts. These are used on gaskets when connecting elements of the exhaust system.

Ceramic sealants (they are also called pastes or cements) after hardening become completely immobile (stone). Because of what it is used to cover up cracks or rusted holes. Accordingly, if vibrations occur, they can crack.

There are always small shifts and vibrations between the elements of the car exhaust system. Moreover, even in motion, the car constantly vibrates by itself. Accordingly, it is desirable to use a silicone-based muffler paste. Silencer cement is only suitable for processing the body of the silencer itself.

Sealant type

Sealing materials used to repair exhaust system components are divided into several types that differ in their performance characteristics.

• Exhaust System Repair Adhesive. Such compositions are intended for sealing small holes and / or cracks in the exhaust pipe and other parts. usually created on the basis of fiberglass and additional additives. It differs in that it quickly hardens (in about 10 minutes). Resistant to thermal stress, however, under strong mechanical stress, it can also crack.
• Mounting paste. Typically used for flange and hose connections. usually used when installing new parts or when repairing and installing refurbished ones. Under the influence of high temperatures quickly hardens and keeps its properties for a long time.
• muffler sealant. This is one of the most common options. It is based on silicone with thermal additives. It can be used both as a preventive and repair agent. Silicone sealant can be used specifically in the muffler, pipes, resonator, exhaust manifold. It doesn't freeze right away.
• Silencer Cement. These compounds have a very high hardness and withstand the highest temperature. However, they can be used to repair only fixed parts - muffler housings, resonator, as well as for processing joints. Cement dries very quickly under the influence of high temperature.

Rating of the best muffler sealants

Despite all the variety of samples on sale, there are still seven of the best and most popular sealants that are used not only by domestic, but also by foreign drivers. Below is detailed information about them. If you have used any other - write about it in the comments below.

Liqui Moly

Exhaust Sealant Liqui Moly Auspuff-Reparatur-Paste. Positioned as a paste for sealing damage. It contains no asbestos and solvents, it is resistant to high temperatures and mechanical stress. With the help of liquid moth paste, you can easily seal small holes and cracks in the elements of the exhaust system. Heat resistance - +700°C, pH value - 10, odorless, color - dark gray. Liqui Moly Auspuff-Reparatur-Paste 3340 is sold in 200 ml tubes. The price of one package as of the summer of 2019 is about 420 Russian rubles.

Before using muffler repair paste, the surface to be applied must be thoroughly cleaned of debris and rust. Apply the product to a warm surface

Mounting paste Liqui Moly Auspuff-Montage-Paste 3342. Designed for mounting exhaust pipes. The parts mounted by it do not stick and, if necessary, they can be easily dismantled. Thermal resistance is +700°С. usually, the paste is used to process flange connections, clamps and similar elements.

Sold in a 150 ml bottle. The price of a package for the above period is about 500 rubles.

LIQUI MOLY Auspuff-bandage gebreuchfertig 3344 muffler repair kit. This set of tools is designed to repair large cracks and damage in the exhaust system of the car. Provides tightness.

The kit includes one meter of fiberglass reinforcing tape, as well as individual work gloves. The bandage tape is applied to the injury site with the aluminum side facing out. The inner layer is impregnated with a sealant, which hardens when heated, ensuring the tightness of the system.

Muffler assembly paste LIQUI MOLY KERAMIK-PASTE 3418. It is used for lubrication of highly loaded sliding surfaces, including those operating at high temperatures. The fasteners of the muffler elements are treated with paste - bolts, sections, pins, spindles. It can be used for processing elements of the brake system of a car. Operating temperature range — from –30°С to +1400°С.

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Donate Deal

The DoneDeal brand also produces several sealants that can be used to repair an exhaust system element.

Ceramic sealant for repair and installation of exhaust systems DonDil. Is high-temperature, maintains the maximum value of temperature to +1400 °C. Setting time - 5 ... 10 minutes, hardening time - 1 ... 3 hours, full polymerization time - 24 hours. With the help of a sealant, cracks and damage on mufflers, pipes, manifolds, catalysts and other elements can be treated. Withstands mechanical loads and vibrations. Can be used with both steel and cast iron parts.

Reviews say that it is easy to work with the sealant, it is well smeared and smeared. The surface on which it will be applied must be prepared in advance - cleaned and degreased.

Among the shortcomings, it is noted that DoneDeal heat-resistant ceramic sealant dries very quickly, so you need to work with it quickly. In addition, it is quite harmful, so you need to work in a well-ventilated area, and wear gloves on your hands.

The sealant is sold in a jar of 170 grams. The package has the article DD6785. Its price is about 230 rubles.

DoneDeal Thermal Steel Heavy Duty Repair Sealant under the article DD6799 is itself heat-resistant, withstands temperatures up to +1400 ° C, it can be used to eliminate holes in steel and cast iron parts, including those operating under significant mechanical stress and under conditions of vibration and stress.

With the help of a sealant, you can repair: exhaust manifolds, cast-iron engine block heads, mufflers, catalytic afterburners, not only in machine technology, but also in everyday life.

It is necessary to apply the sealant on the prepared (cleaned) surface, after applying it is necessary to give the sealant about 3-4 hours for it to dry. After that, begin to warm up the part to ensure drying and normalization of its characteristics.

It is sold in a package of 85 grams, the price of which is 250 rubles.

Done Deal Ceramic Tape for muffler repair. Has the article DD6789. The bandage is made of glass fiber impregnated with a solution of liquid sodium silicate and a complex of additives. Temperature limit - + 650 ° С, pressure - up to 20 atmospheres. Ribbon size 101 × 5 cm.

Apply the tape to the cleaned surface. When providing a temperature of +25°C, the tape hardens after 30 ... 40 minutes. Such a tape can be further processed - sanded and applied with heat-resistant paints. The price of the package is 560 rubles.

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CRC

Under the CRC trademark, two basic tools for the repair of exhaust system elements are produced.

Glue putty for repair of exhaust systems CRC Exhaust Repair 10147 Gum. This tool is used to eliminate small cracks and holes in the elements of the exhaust system without dismantling it. With the help of glue, mufflers, exhaust pipes, expansion tanks can be processed. The maximum operating temperature is +1000°С. Does not burn, is a black putty.

Differs in fast hardening time. At room temperature, it completely hardens in about 12 hours, and with a running internal combustion engine in just 10 minutes.

Apply to prepared, cleaned surface. Packing volume - 200 grams, price - 420 rubles.

CRC EXHAUST REPAIR BANDAGE 170043 used for sealing large holes and / or cracks. With it, you can similarly repair muffler housings, expansion tanks, exhaust pipes.

The bandage is made of fiberglass impregnated with epoxy resin. Does not contain asbestos. The maximum temperature is +400°C. It enters into a chemical reaction with the metal of the repaired part, which ensures its reliable fastening. Hardens quickly. When applying to the place of damage, care must be taken to ensure that there is a distance of at least 2 cm from this place to the edge of applying the bandage. To enhance the work of the bandage, it is recommended to additionally use CRC Exhaust Repair Gum muffler glue.

It is sold in the form of tapes 1,3 meters long. The price of one tape is about 300 rubles.

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permatex

Permatex has 3 products that are suitable for repairing car exhaust system components.

Permatex Muffler Tailpipe Sealer X00609. This is a classic muffler and tailpipe sealant that will not shrink once applied. It has a high maximum withstand temperature - + 1093 ° С. Does not pass gases and water. With the help of Permatex sealant, you can repair mufflers, exhaust pipes, resonators, catalysts.

The sealant is applied to the cleaned surface, previously moistened with water. After application, allow the agent to cool for 30 minutes, and then run the internal combustion engine at idle for approximately 15 minutes.

If the product is applied to a new part, then the sealant layer should be about 6 mm and it must be applied to the part with a larger contact area. Sold in a tube of 87 ml. The price of such a package is 200 rubles.

Permatex Muffler Tailpipe Putty 80333. This is a muffler cement sealer. Heat-resistant, the maximum allowable temperature is +1093°С. It differs in that it withstands mechanical loads worse, has a long curing time (up to 24 hours), but also a lower price. The instructions indicate that it can be used to repair mufflers and exhaust pipes on machinery, trucks, tractors, special and agricultural machinery.

Sold in a 100 gram bottle. The price is 150 rubles.

Permatex Muffler Tailpipe Bandage 80331 — bandage for the muffler pipe. It is traditionally used for the repair of mufflers and exhaust systems of trucks and cars, special equipment. The maximum temperature is up to +426°С. The area of ​​one tape is 542 square centimeters.

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APRIL

Silencer cement ABRO ES 332, that is, a heat-resistant sealant for the repair of elements of exhaust machine systems. Used to repair holes and cracks in mufflers, exhaust pipes, catalytic converters, resonators and other elements. Excellent resistance to vibration and mechanical stress. The maximum allowable temperature is +1100°С. Provides a high level of tightness, durable.

The sealant is applied to the cleaned surface. If it is planned to repair large damage, it is recommended to use metal patches or metal perforation mesh. Complete polymerization of the composition occurs at normal temperature after 12 hours, and when the internal combustion engine is idling - after 20 minutes. Tests show a fairly good result of use. However, with the help of Abro sealant, it is better to process small damages.

It is sold in a bottle of 170 grams, its price is approximately 270 rubles.

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bosal

Sealant cement for exhaust systems Bosal 258-502. Designed for the repair of mufflers, exhaust pipes and other parts of the exhaust system. Provides a high level of sealing. It can be used as a sealant for gaskets, as well as for nominal laying between individual parts of the system.

Bosal sealant cannot be used as an adhesive for mounting parts in the system. Resistant to vibration and mechanical stress. It has a high curing speed, so you need to work with it quickly. Dense polymerization occurs after 3 minutes, and with a running motor it is also faster.

It is sold in packages of two volumes - 190 grams and 60 grams. The price of a larger package is about 360 rubles.

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HOLT

Exhaust Sealant Holts Gun Gum Paste HGG2HPR. It is a traditional muffler and exhaust pipe repair paste. It can be used on machine and special equipment. Perfectly seals small leaks, holes, cracks. Creates gas and watertight connections. Does not contain asbestos. Suitable for temporary repair of mufflers. Sold in a 200 ml jar. The price of one such package is 170 rubles.

Paste sealant Holts Firegum HFG1PL for muffler connections. It is used not as a repair, but as an assembly tool, that is, when installing new parts in the exhaust system. Sold in a 150 ml bottle. The price of the package is 170 rubles.

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What can replace the sealant for the muffler and for the exhaust system

The products listed above are professional and specifically designed for car exhaust system components. However, drivers and craftsmen at service stations for repair work can use not only them, but also additional universal tools. Among them:

• Cold welding. An inexpensive chemical agent designed to “glue” metal surfaces together and repair cracks. Cold welds are produced under different brands, respectively, they have different characteristics. Therefore, when choosing, you need to make a choice of heat-resistant welding. Usually, for the complete solidification of this agent, approximately 10 ... 12 hours should pass at natural temperature. Efficiency depends, firstly, on the manufacturer, and secondly, on the preparedness of the surface and the nature of the damage.
• Exhaust System Rebuild Kit. They are different, but usually the kit includes a bandage tape for wrapping damaged system elements (non-combustible), wire and liquid sodium silicate. The tape is wound to the surface with a wire, and then treated with liquid silicate. Thanks to this, the repair kit can withstand very high temperatures.
• High temperature compound for working with metal parts. It is based on ceramic fillers with the addition of stainless metal. With it, you can repair parts from a variety of metals - steel, cast iron, aluminum. Solidification of ceramic fillers occurs when the mounting layer is heated. It has a high mechanical strength, but the price of such kits is quite high.

Hack and predictor Aviator

A sealant for a car muffler can help temporarily deal with the depressurization of the exhaust system and its individual parts - the muffler itself, the resonator, the exhaust manifold, connecting pipes and flanges. On average, the work of a cured sealant is about 1,5 ... 2 years.

The sealant is not intended to eliminate significant damage, so additional repairs must be carried out with them. When processing the joints of the exhaust system elements, it is better to use silicone sealants, since they ensure the normal vibration of the elements. And ceramic sealants are suitable for repairing muffler housings, resonators, pipes.