Rating of the best window sealants for 2024

When installing plastic windows, you can often notice that the joints between the window and the slopes are poorly glued. Most installation companies will agree to fix this imperfection for a separate fee, but usually this is then done by the customer himself. And here the window glue-sealant will come to the aid of the amateur installer, with the help of which you can perfectly seal the voids between the window sill and the window frame.

Sealant properties

The sealant itself is a plastic mass consisting of polymers. In most cases, it is similar in consistency to toothpaste. The agent must be applied to the area to be treated (on the surface, pour into the hole), after which the paste will slowly solidify. Upon completion, a layer will be formed that does not allow moisture or air to pass through. Thus, the hermetic composition will prevent unwanted drafts or heat leakage from the room. At the same time, the sealing agent will increase the resistance of metal-plastic structures to environmental influences and possible temperature changes. Basically, sealants are white, which allows them to look aesthetically pleasing and not stand out against the background of snow-white window frames.

Varieties of sealants

Currently, there are many types of glue-sealant, each of which has certain properties. And each of them is good for certain applications. Among all the variety, the most popular are those samples that have increased adhesion (adhesion) and strength. These include sealants that contain:

• Silicone base - the composition of such a tool includes organosilicon substances, and it is considered quite universal. It can be used both for processing external (street) structures and indoors. Silicone sealants are elastic, have increased properties for adhesion of surfaces. It is very simple to work with it - it is applied without any special efforts. The price of such a composition is more than democratic. Acids may be included in the silicone sealant, which is directly indicated on the package. Such inclusion increases the elasticity, however, after application in a closed room for about half an hour, a pronounced smell of vinegar will be felt (fortunately, it will not remain forever and will disappear quickly enough).Acidic sealants, in contrast to neutral ones, also have a reduced tendency to deform over time, therefore they are preferable to use them for outdoor work. Due to the presence of contained acidic compounds, it is less susceptible to the formation of mold and mildew on them. In addition, they retain their snow-white white color longer, even under the influence of ultraviolet radiation.
• Acrylic base - sealants on this basis also interact well with PVC products, in principle, even slightly inferior to those described above in terms of strength properties. By their composition, they are quite elastic, and in an uncured state they can be easily removed (simply washed off). Acrylic sealants are recommended for outdoor use, since they are particularly resistant to sun rays and heavy rainfall. For indoor use, such compositions are not recommended, because during the solidification process they become porous, while absorbing foreign vapors. Subsequently, such fumes are retained in the structure of the sealant, from which the sealed joint will darken over time. Thus, if acrylic glue was used for interior decoration, then from time to time it will have to be tinted. It is worth mentioning that acrylic sealants tolerate heavy rainfall well, but not too low temperatures (they can crack).
• Polymer base - the composition of such an adhesive is based on MS polymers. It is also popularly called "liquid plastic". Differs in accelerated hardening and excellent adhesion. By and large, it can be argued that after sealing the seams between the frame and the window opening with it, they will form a single whole. Its disadvantages include some fragility - an established seam may not cope with excessive loads (for example, a large thickness of ice or snow). As for its other properties, it is a high-tech material and therefore the price for it is quite high.
• Polyurethane base - this sealant is characterized by increased elasticity, resistance to stretching and any deformation, as well as increased water-repellent qualities. Extremely unpretentious with weather conditions, including exposure to direct sunlight. Due to its strength, it perfectly resists low temperatures, therefore it is recommended for use in regions with frequent frosts. Once this sealant has cured, it is easy to paint and maintains color for a long time.
• Butyl base - contains a substance similar to rubber. Thanks to this inclusion, such sealants are able to maintain their elasticity in extreme temperatures - from +55 to -100 degrees Celsius. It successfully resists direct ultraviolet rays and does not contain any impurities harmful to humans. Has increased vapor resistance. However, it is recommended for sealing only small recesses and holes in glass units.
• Thiokol base - here the base is polysulfide elements. This product is characterized by its ability to quickly set in almost any conditions, regardless of the ambient temperature and humidity level. A similar sealant is recommended for the treatment of external structures. Moreover, both with liquid and solid precipitation it is able to withstand increased loads.

Special sealants

These include the domestic development "Stiz", which has been successfully competing in the market with fashionable Western brands for the past 20 years. This product is made on the basis of acrylic and is one-component. This sealant is of two types - marked "A" and marked "B". The first "Stiz" is vapor permeable, and the second, on the contrary, is vapor barrier. Accordingly, the first one is used for outdoor work and is responsible for ensuring that moisture from the assembly foam is well removed outside and does not reduce the thermal insulation properties, and the second does not allow steam / moisture to penetrate into the seam from the room.

In general, both Stizes have the following characteristic properties:

• High degree of adhesion (even if the treated surfaces are wet);
• High resistance to ultraviolet light;
• Upon completion of the hardening process, it can be calmly plastered or painted;
• The application process is possible using any tool - using a special pistol, spatula or brush.

Algorithm for processing (sealing) seams

This procedure is not so difficult, therefore, using the services of strangers to carry it out, and even more so for a fee, is unreasonable and unnecessary spending. With the instructions attached to any sealant, this is quite simple to do:

1. Prepare tools and consumables - a syringe (or a gun) through which the sealant will be applied, a container for water, construction tape (or tape);
2. Prepare slopes - glue the construction tape in such a way as to exclude the ingress of sealant on the window structure;
3. Clean the working area - remove all dust and dirt, greasy stains, and it is forbidden to remove greasy stains with acetone-based solvents, because subsequently matte stains, cloudy stains that are pronounced against a general white background may appear;
4. Apply the required amount of sealant to the seam area with a gun or syringe, while the spout must be held at an angle so that it smooths the applied material;
5. The resulting irregularities must be immediately smoothed out with a solid object soaked in water (even with a standard school ruler), this simple method will avoid sticking of glue;
6. After the completion of the general front of work and before the final hardening of the material, it is better to smooth out the existing irregularities with a wet sponge, so as not to damage the integrity of the sealed seam.

Helpful tips for choosing

In order to correctly select the desired sealant, you should use the following tips from professionals:

• You should not chase too cheap goods, reliability and efficiency - these are the very parameters on which it is absolutely not worth saving;
• Before buying, it is imperative to familiarize yourself with the information provided by the manufacturer (conditions of use, composition of the mixture, instructions for use, etc.);
• If the buyer doubts the choice of the type of sealant, (that is, on what basis it is better to take it), then you should stop on a silicone basis, since in most cases it will be universal.
• If the price for the buyer is of little importance, then it is possible to opt for an expensive polyurethane agent;
• It is necessary to choose only those brands that have good recommendations.

Be sure to read the expiration date of the sealant !!! After long storage, it can deteriorate and lose all its useful properties, which, of course, spoil all the work done.

Rating of the best window sealants for 2024

Silicone mixtures

2nd place: Ceresit CS 25

One of the best silicone sealants for sealing voids and joints. It can also be used as a grouting agent. A special acid impregnation has been added to the base of the composition, which counteracts the appearance of mold and mildew. Differs in a stable color.

Name	Value
Standard volume in liters	0.5
Basis type	Silicone
Scope of application	Station wagon
Manufacturer country	Germany
Price, rubles	150

• Fits perfectly into voids;
• Resistant to the appearance of fungus;
• Easy to clean.

• Poor adhesion to rubber bases.

1st place: Belinka Belsil Sanitary Acetate

Perfect for sealing newly installed insulating glass units. The composition includes not one, but several antifungal additives, which almost completely eliminates the appearance of black plaque. Has increased adhesion parameters, has high viscosity.

Name	Value
Standard volume in liters	0.5
Basis type	Silicone
Scope of application	Station wagon
Manufacturer country	Slovenia
Price, rubles	300

• Excellent adhesion;
• The mixture is extremely viscous, therefore it perfectly seals even the smallest voids;
• Multifunctionality.

• Not found.

Acrylic blends

2nd place: Krass Universal

This sealant is distinguished by almost zero shrinkage during operation. Excellent adhesion to the treated surfaces. When used, it does not spread, but evenly fills the processed seam and voids. Fire safety and heat resistance should be highlighted separately.

Name	Value
Standard volume in liters	0.5
Basis type	Acrylic
Scope of application	Station wagon
Manufacturer country	Poland
Price, rubles	400

• Heat resistant;
• There is no shrinkage;
• Multifunctional.

• Difficult to find in retail.

1st place: Makroflex FA131

This sealant firmly bonds most common materials. It has excellent elasticity and is also resistant to low temperatures. After hardening, it does not wash out, does not crack, successfully resists powerful air currents. Recommended for outdoor use.

Name	Value
Standard volume in liters	0.5
Basis type	Acrylic
Scope of application	Low temperature areas
Manufacturer country	Germany
Price, rubles	350

• Frost resistance;
• Lack of extraneous odors;
• Reinforced grip.

• Highly specialized.

Polyurethane mixtures

2nd Place: Dow Corning 7091

Anti-corrosion sealant made from a single component. Has increased adhesion, antifungal substances are included in the composition. It adheres especially well to glossy surfaces and is itself extremely water-resistant. Color variations of the paste are possible.

Name	Value
Standard volume in liters	0.5
Basis type	Polyurethane
Scope of application	Station wagon
Manufacturer country	USA
Price, rubles	1500

• Nice smell;
• Multifunctionality;
• Color variability.

• High price.

1st place: TYTAN PROFESSIONAL PU 40

This sample is not only suitable for filling voids in window openings, but can also be used for carpentry, locksmith and plumbing work. Separately, it can be used to improve waterproofing. It has good adhesion to almost all materials.

Name	Value
Standard volume in liters	0.5
Basis type	Polyurethane
Scope of application	Station wagon
Manufacturer country	Poland
Price, rubles	500

• Increased tensile strength;
• Industrial grade sealing;
• Wide range of applications.

• Available in gray only.

Thiokol mixtures

2nd place: UT-34

One of the best representatives of domestic brands. It contains manganese dioxide, which offers increased adhesion to metal surfaces. It is packaged only in large containers from 17 liters. It is positioned on the market as an example of industrial sealant. Filling is possible with a syringe or pistol.

Name	Value
Standard volume in liters	17
Basis type	Thiokol
Scope of application	Industry
Manufacturer country	Russia
Price, rubles	1200

• Extended shelf life;
• Improved work with metal surfaces;
• Reduced hardening time (from 5 hours).

• Packing is available only in large volumes.

1st place: Thixoprol-AM

Another sample from a Russian manufacturer. Thanks to its improved formula, it is able to provide the best adhesion to almost all materials. Supplied in a large container. More focused on the private user. Has an extended shelf life.

Name	Value
Standard volume in liters	14
Basis type	Thiokol
Scope of application	Domestic
Manufacturer country	Russia
Price, rubles	600

• Possibility of applying with both a brush and a gun;
• Increased packaging containers;
• Accelerated solidification phase.

• Toxic (it is recommended to work in personal protective equipment).

Bituminous mixtures

2nd place: TEGRA Bitumen

This product is excellent for concrete, masonry, wood and plastics. Its consistency is resilient and elastic, which makes it easy to apply it to the treated surface. It interacts well even with wet and greasy materials. The formula has been modified.

Name	Value
Standard volume in liters	0.3
Basis type	Bitumen
Scope of application	Domestic
Manufacturer country	Germany
Price, rubles	450

• Extremely affordable price with bulk functionality;
• Has heat resistance;
• Resistant to aggressive environments.

• Not found.

1st place: Bitustik

This sealant is intended for full-scale construction and domestic work. With its help, it is possible not only to cover up the seams and voids in window openings, but also to fix the tiles, and to smear the brickwork. It is one-component in composition and is frost-resistant.

Name	Value
Standard volume in liters	5
Basis type	Bitumen
Scope of application	Household, construction
Manufacturer country	Russia
Price, rubles	2900

• Possesses frost resistance;
• Wide scope of application;
• Fast adhesion (from 3 hours).

• High price.

Instead of an epilogue

The sealant market today is simply oversaturated with all sorts of brands. However, construction professionals advise purchasing sealants from retailers, even if you cannot save on associated costs. This circumstance is due to the fact that in the Russian Federation, cases have become more frequent when from abroad (especially from the Asian region), when buying from an online store, a consumer bought a completely inoperative product with zero performance properties (often simply expired). It is worth noting that it is better to give preference to Western brands, although for rare works you can also use Russian universal silicone sealants, for example, "Stiz A" and "Stiz B".