The best sealants for automotive engines


In the automotive market, sealants for engines have been in great demand lately. In various forums, both usefulness / uselessness is debated, but in many difficult situations they have already proven practicality. After all, they can replace the gasket of the engine, eliminate the flow of oil, antifreeze, close the tire puncture, glue the parts.

Sealants for car engine

Before buying a product, you should familiarize yourself with the characteristics of different types in order to choose the right one for your conditions, decide which sealant is best for the engine, and which for other parts of the car.

Читать далее, какой герметик для двигателя лучше-->Рассмотрим основные виды этих средств защиты двигателя.

Types of sealants

Anaerobic sealant

Hardening of this type occurs upon contact with metal surfaces. An anaerobic sealant for the engine is applied to a metal part, combined with another, after which the tool hardens. If the drug is exposed to oxygen, it will remain liquid. Because there is no need to rush, using a tool, it will not harden ahead of time, you can safely apply and install parts. Setting time is about 30 minutes.

Anaerobic sealant for the engine

Disadvantage of the drug: anaerobic sealant can not cope with areas above 0.5 mm, the thickness of the joints should also be uniform. Therefore, with a little experience, it is better to entrust the work with the drug to professionals; qualification, special equipment, and practical experience will be useful.

Silicone Sealant

Excellent tool for non-professionals in dealing with auto-sealants. The drug is durable, elastic, with increasing pressure ensures tightness, while applying damping strain. Hardening is done at the expense of moist air. Hold the product in the air for about 10 minutes to obtain the gasket.

Silicone Automotive Sealant

Silicone sealant fills bumps up to 6 mm, not as demanding as anaerobic drugs. Some species are used in industry, using ultraviolet to harden.

Synthetic auto-sealant

The composition of these funds includes synthetic resin. This type is unpopular with motorists. Suitable for home use.

Features of sealant packaging

Foreign manufacturers are more often used as packaging for drugs used plastic or aluminum tubes. They are supplied with tubes with a dispensing cap, filled 40 or 90 grams.

Sealant gray 85 grams

Benefits of dispensers:

  • funds with dispenser are convenient to apply;
  • the tool does not dry out after opening the tube;
  • Surplus from the dispenser is easily removed with a match.

Russian preparations are usually offered in aluminum tubes with a plastic cap.

Professional sealants require the use of a special gun, without which the agent can not be applied.

Tubes of large volume are recommended to be purchased with frequent repairs - to car service specialists. Discounts for new cars! Profitable loan from 9.9% installments 0%, for example. For one car, it is more practical to take a small amount, although it is somewhat more expensive, but it will not have time to dry until the storage period has expired.

Sealant Application Rules

A few recommendations will help you make the most effective use of tools for car repairs:

  • Prepare the surface on which the sealant will be applied, clean it from dirt, dust, dry.
  • Defat by means of white spirit or gasoline.
  • Carefully not to scratch the surface, remove the remnants of old seals. Do not use, for example, sandpaper.
  • Apply the product to one of the parts to be joined. Make sure that the line forms a closed, solid, without breaks, in a layer of 1 mm, not more, since the excess mass will squeeze out and may get into other places, littering them.
  • Give the sealant 10–15 minutes to dry, connect the parts, tighten the bolts, wait another 20 minutes and tighten the fasteners. Do not overtighten.
  • Allow sealant to dry for better tightness. The time is indicated on the package: usually 0.5–12 hours.

Overview of common sealants

Oil system sealant

Recommended sealant oil system for diesel, carburetor engines, as a means of getting rid of leaks, restore elasticity, the size of the glands, rarely removed caps, engine gaskets. Can be used for prevention.

Oil system sealant


  • compatible with all types of oils;
  • prolongs the life of the engine.


Sealants, presented by Henkel, are highly effective products. Anaerobic flange sealant 574 hardens at 15–25 degrees, forming a durable polymer layer. Loktayt is applied between metal surfaces, where it is polymerized in the absence of air. Serves as a sealant on tightly fitting surfaces with a small gap.

Loctite 574 Sealant

Dow Corning Q3-1566

Heat-resistant composition, freezes at room temperature. Resistant to motor oils, coolants. Let's apply for the pallet of a case of the engine, flanges.

Logo dowcorning sealants


Belgian-made polyurethane sealant for professionals, car owners with experience in handling this type of product. It is used for repairs to the engine sump pan, on the surface of the flanges. It stiffens in 40–60 minutes. Oil pour only after full hardening.

Soudal oil sealant


Metal-ceramic sealant 9041/9043

Reliable tool for antifreeze leaks in cylinder head gaskets. Repair of cracked aluminum, cast iron heads, motor blocks is not inferior in quality to welding. High-Gear withstands vibration, pressure, temperature drops, does not dissolve. High strength characteristics give the composition of the finest ceramic fibers. The drug is able to repair damage with a large cross section.

Hi-Gear automotive sealant

Engine repair sealant

Excellent sealant for the engine lubrication system, mechanical transmission repair. Guarantees the elimination of oil leaks through gaskets, seals. Benefits:

  • eliminates costly repairs;
  • prolongs the operation of the engine;
  • tested for compliance with Russian brands of oils, compatible with synthetic, mineral, engine oils.

Hi-Gear repair sealant

Hylomar M

Universal remedy based on polyester urethane. Blue plastic. Resistant to various liquids: fuels, oils, water, glycol, methanol, kerosene solutions. Occupancy rate - 0.2 mm.

Hylomar M sealant

Motor Sealant K157 FÖRCH 5

Highly resistant to temperature, pressure means, perfectly preserving elasticity. It is used for engine flanges, autoclaves, compressors, threads, well seals glass, metal, ceramic surfaces. Benefits:

  • the duration of the sealing time;
  • excellent grip;
  • high chemical resistance;
  • availability of a convenient dosing system;
  • profitability.

Curing occurs when heated to 70-100 degrees.

K157 FÖRCH 5 Sealant

The disadvantage is not recommended for use in cylinder heads as a gasket.

Motor Cabinet Gasket K161

Excellent for narrow shales, ideal for sealing small holes. Treats anaerobic drugs, without silicone. Resistant to pressure, chemical substances. After solidification, it acquires stiffness, is able to replace rigid gaskets.

Motor Cabinet Gasket K158

Permanently elastic composition based on polyurethane, without silicone. Resistant to many liquids: fuel, oils, combustion products, antifreeze solutions. Fills holes, irregularities of 0.2 mm.

Forch sealant application

K165 / K166 / K167 Silicone Sealants Series

Characterized by a high degree of chemical resistance, high penetrating characteristics. Recommended for sealing gearboxes, cylinders, for the engine pan. Not applicable for fuel tanks.

Sealants are good tools for repairing the engine, it is useful to have them with you on the way in case of a sudden breakdown, in the garage during maintenance work. They will help your car last longer. The main thing here is the correct selection of the type and brand of sealant, as well as application in compliance with the rules and recommendations of the manufacturer.