12 best car sealants

Review of the best according to the editorial board. On the selection criteria. This material is subjective and does not constitute advertising and does not serve as a purchase guide. Before buying, you need to consult with a specialist.

When repairing a car, several types of sealants are used. The general purpose of these substances is to seal the joint, increase the strength of the fixation point, protect the joint from the passage of air and dust, and glue the materials. This is necessary for body repair, glass installation, replacement of elements in the exhaust system, in the cooling circuit or for repairing a punctured tire. We've compiled a list of the best automotive sealants that are great for these tasks. This is confirmed by the characteristics of the product and customer reviews. The information will help you choose the best product for your specific use.

Rating of the best sealants for cars

Nomination	a place	Name of product	price
Best Automotive Body Sealants	1	Liqui Moly Liquimate 8300 Nahtabdichtung	990 RUB
	2	TEROSON Terostat 9220	987 r
	3	CHAMAELEON	522 RUB
	4	Novol Gravit 630	361 RUB
Best Automotive Glass Sealants	1	IGLASS CLASSIC	127 RUB
	2	Done Deal DD 6754	450 RUB
The best sealants for automotive exhaust systems	1	Bosal 258021	953 r
	2	Liqui Moly 3342	540 RUB
	3	Done deal Dd6799	RUB 350
The best automotive sealants for cooling systems	1	Liqui Moly “Pro-Line Kuhlerdichter K”, 0.25 L	1 268 RUB
	2	Hi-Gear HG9041	RUB 510
The best puncture repair sealant	1	Hi-Gear HG5339	RUB 635

Best Automotive Body Sealants

When straightening the body after an accident or careless entry into the garage, it is not always possible to restore the factory gaps (in the 'glasses', the inner part of the wings, doors). And if the surface is leveled with putty, then the joints are sealed with automotive sealant. It is also used for sealing when fixing the trim in the trunk, cabin, hood and on the doors.

Liqui Moly Liquimate 8300 Nahtabdichtung

Rating: 4.9

In the first place in the rating in this category is a polyurethane sealant from a German manufacturer. The product is produced in an aluminum tube and is equipped with a spout for easy application. The tapered outlet allows you to adjust the width of the extruded strip. To do this, you need to cut off the tip to the desired diameter. The glue can be spread with a brush and even sprayed with a spray gun if you need to fix a large part of the sheathing. There is no solvent in the composition and the product does not smell like anything, which customers like in reviews. After drying, it is allowed to cover the vehicle with varnish, and this can be done immediately when a surface film forms. The substance is not affected by water and even chemicals.

Our experts have added the sealant to the rating as it belongs to a special professional series. It can be used in the engine compartment and other parts of the car. The substance retains its elasticity after hardening – vibration on the body will not create cracks. The glue is also UV resistant and will not deteriorate from exposure to the sun.

Advantages

• convenient tube with a spout;
• does not decompose from the ingress of mineral oils;
• gray color helps to control the area of ​​application;
• there is no specific smell;
• good adhesion to the car body.

disadvantages

• high price;
• can not be applied at temperatures less than +5 degrees.

TEROSON Terostat 9220

Rating: 4.8

The second place in the rating is for an automotive product from Teroson. The one-component substance is based on MS polymers. Upon contact with air, it quickly solidifies and creates an elastic layer that does not collapse from vibration of the body. The sealant is resistant to sunlight and UV rays. The composition does not contain silicones, isocyanates, solvents. It can be applied to painted car parts as the product adheres well to smooth surfaces. Buyers in the reviews are glad that there are two packages – 80 and 310 ml each, which helps to purchase a small amount if a vehicle is needed for a small area.

We have added the sealant to the rating due to the increased adhesion. It bonds the materials so tightly that you can do without the usual fasteners (rivets, screws). If you need to attach a paper soundproofing panel in the trunk compartment, then it is enough to coat the perimeter and hold the part for 20 minutes. The sealant glues iron, plastic, paper, plywood.

Advantages

• there is a packing of 80 and 310 ml;
• black color is hardly noticeable, even if the treated area is not tinted;
• suitable for indoor and outdoor use;
• high modulus of elasticity.

disadvantages

• high price;
• until it dries, there is a smell (especially felt in the car interior).

CHAMAELEON

Rating: 4.7

In third place in the rating is a sealant from the German brand Chamaeleon. It is based on polyurethane and is versatile. Differs in fast drying within 10 minutes. Sticks to metal, plywood, plastics. The surface does not need to be scraped for better grip. This helps to maintain the integrity of the paintwork and prevent corrosion. The vehicle is available in white and gray. The price of the sealant is two times lower than that of the leaders in this rating category. Users in reviews report that the sealant does not flow after application. This helps to accurately lay it on the side of the part and does not stain adjacent parts of the body.

The automotive product got into the rating due to the presence of a capacity of 850 ml, which is useful for voluminous work on the body. The product is sold in a can and can be conveniently applied with a brush, spatula, or filled into a spray bottle. In a large container with a lid, the remainder is easy to store, unlike a tube, which has already been sealed. Such a sealant is a great option for service stations and garages.

Advantages

• painting from above with varnishes and paints is allowed;
• two packaging options for 365 and 850 ml;
• does not crack when hardened;
• affordable cost with German quality.

disadvantages

• white traces must be painted over;
• there is a specific smell.

Novol Gravit 630

Rating: 4.6

Completing this rating category is another polyurethane car sealant from Novol. The Polish manufacturer offers glue for processing welds, filling gaps, sealing between automotive materials. This eliminates drafts, dust lodging and mold build-up. Allowed application temperature +5 … + 35 degrees. The tube is designed for use in a construction gun. Reviews users like the elasticity of the sealant and the affordable price.

The product got into the rating due to the lack of shrinkage or foaming – the seam remains the same as it was when applied. This helps the technician to accurately control the amount of material supplied and reduce subsequent work on wiping off excess material. Also, the sealant is available in three colors at once (white, black and gray), which makes it easier to select a product to match the color of car elements. In the engine compartment, this is not so important, but the protruding white strip between the arch and the wheel arch liner will be conspicuous, which will not happen when using this glue.

Advantages

• enters into a chemical compound with glass, plastic, wood, metal;
• good adhesion;
• convenient tube for making long seams;
• does not wrinkle after application.

disadvantages

• if the treated area is warmed up in the sun (over 50 degrees), then the sealant will soften a little;
• dries for almost a day with a layer of 3-4 mm;
• does not adhere well to surfaces with traces of oil.

Best Automotive Glass Sealants

When replacing car windows (windshield and rear), adhesives are used that connect the rubber circuit with iron and glass. This protects the interior from leaking during rain, washing, or washer activation. Here are the top sealants in this category with the most positive reviews.

IGLASS CLASSIC

Rating: 4.9

Here, in the first place in the rating, we placed Iglass Classic sealant. It is a one-component automotive product with a polyurethane base that bonds glass to other materials firmly. For high-quality adhesion, the agent does not need to be heated, like other sealants – cold application is allowed. It can be used for pasting car glass with antenna. The seal withstands dynamic loads and does not crack from vibration. The black color completely merges with the glass elastic and is not visible even upon close examination. After spreading over the surface, the film is formed within 25-40 minutes. In reviews, buyers report that the sealant can be squeezed out of the tube simply by hand pressure. This will help if there is no construction gun nearby.

In our opinion, the product should be in the rating of the best due to the anti-corrosion agent provided to the body. Even if the iron perimeter of the front opening of your car has already lost its paintwork, the application of this product will not only fix the glass, but also protect the metal from rust.

Advantages

• no pungent odor;
• the composition does not include solvents;
• can be applied cold;
• easily squeezed out of the bottle.

disadvantages

• sags a little after drying – you need to serve a little more so that the joint does not leak;
• a layer of 3.5 mm will polymerize for a day;
• unpresentable packaging (foil tube without inscriptions).

Done Deal DD 6754

Rating: 4.7

A sealant for eliminating local leaks in car windows also fell into this rating category. If after washing or rain you find a wet spot on the ceiling or along the perimeter of the glass, then it is necessary to move the rubber seal, clean the place of debris and dust, degrease and fill with this agent. The sealant is produced in a tube with a capacity of 85 g and is completed with a thin spout, through which it is convenient to feed the glue into narrow places. The composition of the automotive product includes: isilan, sisilane, methyltriacetok, ethyltriaxetox. All this ensures the preservation of elasticity and high adhesion to the body. In the reviews, customers like the transparent color of the paste, which suits any shade of the body. Even if you spill too much, it will not be visible.

In the opinion of our experts, the sealant deserves a place in the rating due to the temperature resistance up to -65 degrees. If you operate the vehicle in harsh climates, other media may leak, but it will hold up.

Advantages

• adheres well even to areas of a car body with putty;
• resistant to vibration and moisture;
• retains elasticity;
• convenient to feed into slots through a thin spout.

disadvantages

• high cost – for 85 g you will have to pay more than 500 rubles;
• not profitable with a complete glass replacement – a lot of material is spent on processing the perimeter;
• complete hardening occurs in 10 hours.

The best sealants for automotive exhaust systems

So that the exhaust system from the manifold to the muffler does not have hiss and hiss from the cracks, such places are treated with a car sealant designed for high temperatures. Unlike gaskets, it does not wrinkle and fulfills its role for a long time. Consider the ranking of this category of automotive products.

Bosal 258021

Rating: 4.9

It is a cement based sealant that tolerates exhaust gas temperatures well and does not crack. The substance is fireproof and is intended for the repair of mufflers, exhaust pipes, resonator connections. Acts as a gasket between the flanges of the structure. Can be applied 2-5 mm thick. In case of strong mechanical vibration, it does not fall out of the laying area between two parts. The product is produced in a cylindrical tube, which is suitable for working with a construction gun. Buyers like the fact that there is no asbestos in the composition, so the seal is safe for human health.

The main difference between this sealant is its fast solidification, for which the automotive product is included in the rating. This is practical when urgent muffler repairs are needed and the gap is repaired. But the masters in the reviews warn that everything needs to be prepared in advance for assembling the exhaust gas, since the agent will harden after 5 minutes (with the engine turned on).

Advantages

• 500 g of the substance is enough for a long time;
• vibration resistant;
• dense polymerization in 5 minutes;
• does not collapse at a temperature of +1000 degrees.

disadvantages

• high price;
• cannot be used as an adhesive (low adhesion).

Liqui Moly 3342

Rating: 4.8

The second position in the category of rating of sealants for mufflers and exhaust systems for the German product from Liqui Moly 3342. The car seal is produced in the form of a paste in a tube, therefore it is in high demand among buyers – no assembly gun is required for use. This paste seals well automotive joints with a diameter of 1 to 2 inches. If later you need to dismantle something, then the metal is easily detached from the sealant. The parts do not stick to each other due to the presence of a soft pad.

We recommend this rated product for permanent stays in the vehicle toolbox. If on the road the connection of the exhaust system cracks or displaces, then in the field, by lifting the side of the car with a jack, close the gap and drive in silence, instead of a deafening roar. The threaded cap of the tube prevents the passage of air and the paste can be stored for a long time until an emergency occurs.

Advantages

• safe for hands and respiratory organs;
• resistant to temperatures up to 1000 degrees;
• gas-tight properties after polymerization;
• it is convenient to apply the paste directly from the tube without additional tools.

disadvantages

• sometimes it is required to be moistened with water to increase elasticity during application;
• does not adhere well to rusty parts (preliminary cleaning of the flanges is required).

Done deal Dd6799

Rating: 4.7

Another product in the ranking is Done Deal's automotive exhaust system sealant. The product is positioned as 'thermo steel' due to its high strength after polymerization and its readiness to withstand temperatures up to 1400 degrees. The quality of crack repair is comparable to welding. When applied to metal, it penetrates deeply and mixes with the crystal lattice, forming a single whole. Users in the reviews like that the sealant contains catalytic substances that contribute to the afterburning of fuel.

This sealant is included in our rating because it is suitable for the repair of automotive manifolds. If your car has cracked 'pants' or the exit from the cylinder itself, then with its help you can close the gap and drive for some time until a new part is bought. The paste can withstand temperatures of 1400 degrees and will not disintegrate when used in such extreme conditions. Unlike cement compositions, the substance adheres well to metal (steel, cast iron) and bridges the crack.

Advantages

• high adhesion to steel and cast iron;
• diffusion of the composition into the surface occurs;
• suitable for the repair of the manifold, muffler and even cast-iron heads of the engine block (as a temporary measure);
• welding strength.

disadvantages

• weight 85 g will not last long;
• high price;
• if the flanges are machined, then it will be difficult to separate.

The best automotive sealants for cooling systems

The car uses a circuit through which the coolant circulates. Sometimes the system leaks, to eliminate which sealants are used, filled with antifreeze.

Liqui Moly “Pro-Line Kuhlerdichter K”, 0.25 L

Rating: 4.9

Topped the rating category is a sealant from a German manufacturer. The product looks like a homogeneous powder with plastic chips, which is poured into the expansion tank of the machine. With the help of circulation from the pump, the substance passes through all channels and seals mini cracks and pores. Polymerization begins when oxygen is available (it happens in a broken circuit) and activates the sealant. Buyers in the reviews share that the product helps in cases where the leak is not visible, but just a regular drop in level occurs. The product is compatible with additives added to the technical fluid. The water pump and heating circuit are not adversely affected. With the help of this substance, it will be possible to independently eliminate the leak and do not need to waste time visiting the service.

We put the product in the rating because of its compatibility with any type of antifreeze, and most importantly, with aluminum radiators. The product will not corrode the oxide film and will not clog thin channels on contact with this 'capricious' metal.

Advantages

• seals cracked areas and metal porosity;
• deeply penetrates the soldering;
• the sealant itself finds cracks and cracks in the places where air passes;
• does not deteriorate when the stove is turned on.

disadvantages

• a 250 g bottle is designed for a truck cooling system and the owner of the car will have excess powder;
• can not be stored at negative temperatures.

Hi-Gear HG9041

Rating: 4.8

Another sealant to eliminate leaks in the automotive engine cooling system was developed by an American company. The agent is poured into an expansion tank or directly into a leaking radiator (if it has a separate neck). The substance is carried through the system by a water pump and clogs all crevices and cracks. Suitable for copper, aluminum, cast iron and steel. After polymerization, it further expands, increasing the tightness. Users in the reviews like that the sealant does not wash out from the regular circulation of antifreeze, and also does not harm the water pump.

This sealant is especially suitable for sealing head leaks between additional gaskets. This will come in handy if you are converting your car to gasoline with a different octane rating. The product also contains ceramic particles, so the sealed crack is strengthened from the inside and is suitable for mechanical and thermal stress.

Advantages

• suitable for antifreeze, all types of antifreeze and even water;
• can fill large cracks in the radiator of the stove or the main cooling unit;
• compatible with cast iron, copper and steel;
• the fixing strength is comparable to welding.

disadvantages

• inconvenient to apply from a can – you need a tool;
• high cost for 300 g

The best puncture repair sealant

Tubeless tires are comfortable and easy when changing seasonal tires. But if they are punctured on the road, and there is no spare wheel with you, the car will not be able to continue driving. In such a situation, a tire sealant will help out.

Hi-Gear HG5339

Rating: 4.9

We have added only one American tire repair sealant to this rating category. This is the best tool that will help out in case of an accidental puncture, when there is no tire changer nearby. The product is released in a pressurized container and is equipped with a flexible transparent hose to help control the flow. There are many videos on the Internet with reviews of the use of sealant. To repair a tire (even if it is deflated to the rim itself), it is necessary to turn the wheel with the nipple up and attach it to the cylinder. Pressing starts pumping foam into the tire. At the same time, the wheel begins to inflate. On a repaired tire, you can drive up to 100 km (at a speed of 50-60 km / h).

Our experts liked the sealant because it is able to seal a puncture up to 6 mm in diameter. Even if you damage the tire with a huge self-tapping screw, the tool will cope with the resulting hole and fill it. After the foam has cured, the tire retains its cushioning properties.

Advantages

• instructions for use on the back;
• easy to figure out how to use even a beginner;
• 5 years shelf life;
• supplied with an inflation hose;
• manufactured in the USA.

disadvantages

• it is only a temporary remedy;
• heavily stains the inside of the wheel.

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Attention! This rating is subjective and does not constitute an advertisement and does not serve as a purchase guide. Before buying, you need to consult with a specialist.