8 Best Silicones for Mold Making [2022 Updated ]

What kind of silicone are you looking for? A waterproof sealant for windows and doors or an adhesive for tiles and bricks? In our buying guide you will find further information on this, which will help you choose the product that best suits your specific needs. First, however, you can try to take a look at the most requested silicones on the market; among the various products that we have examined and compared, the most popular are above all the Pattex SL620 , a neutral silicone suitable for plumbing, windows and various materials, and the Fischer DBSA Premium , a construction silicone used in construction and for renovations domestic.

8 Best Silicones for Mold Making [2022 Updated ]

In the first place you will find the classic multi-purpose silicone sealant suitable for both domestic and hobby use and professional, but in the list there are also specific products for use on construction sites and other types with more restricted uses.

1. Pattex SL620 Solyplast neutral waterproof silicone for various materials

 
The Pattex brand belongs to the well-known German chemical company Henkel, famous for household detergents, personal care products and adhesives and sealants. The Solyplast SL620 belongs to the latter category of products; in this case it is an extremely versatile neutral silicone, suitable for applications on windows, roofs, skylights, greenhouses, solar panels, glass, wood, metal, porcelain and masonry.

Once dry it resists temperatures between -40 ° and + 150 °, it is also resistant to chemical and atmospheric agents; the Pattex SL620 is especially appreciated by construction professionals, whose opinions agree in defining it as one of the best silicones of 2021 in terms of value for money and the performance offered.



The only limitation is that it is sold without the front spout; if the thing is not a problem for professionals, in fact, it is for do-it-yourself users, who will have to buy it separately.

Pros

Quality and yield: Pattex SL620 is one of the best-selling silicones online, appreciated both for the production quality of the well-known Henkel brand and for the yield itself; not surprisingly, in fact, it is especially appreciated in the professional field.

Versatile: This neutral silicone is suitable for most surfaces, both porous and non-porous, so its range of applications ranges from roofing and gutters to windows, joinery and masonry.

Colors: The Pattex SL620 that we have examined for you is the transparent translucent one, especially suitable for glass, windows, doors and shower enclosures, but the product is available in over ten different RAL color shades.

Versus

Spout: Unfortunately it is not included in the package and therefore if you do not have it you will have to buy it separately, otherwise you will not be able to use it immediately.

2. Fischer DBSA Premium Bausilicon 53090 construction silicone

 
Compared to other products on the market, the Fischer DBSA Premium Bausilicon has a purely building and mechanical vocation. In fact, thanks to its permanent elasticity, this neutral alkaline silicone is especially suitable for joints and expansion and movement joints, both inside and outside, for mirror gluing and for sealing machinery, appliances and containers.

It can be applied without any problem on different building materials: stainless steel, chrome, primed wood, enameled surfaces, concrete, bricks and other masonry surfaces, it is also great to use in closed spaces because it has a very faint odor.



The further advantage of Fischer silicone is that it contains fungicidal substances, and therefore is also suitable for materials exposed to high humidity. The only flaw, however, consists in its difficulty of use, which makes it unsuitable for amateur and hobby users. It is mainly recommended for professionals.

Pros

Construction silicone: Fischer is mainly intended for use in construction; with the right experience of use, in fact, it can be applied on all types of surfaces. Consequently, it is especially recommended for professionals.

Elastic: Silicone maintains a high degree of elasticity even when dry and over time, which makes it particularly suitable for sealing expansion and movement joints.

Fungicide: Another positive feature is that it contains fungicidal substances, so it is also excellent for use in humid environments, such as bathrooms and kitchens for example.

Versus

For experts: Unfortunately it is not easy to apply for a beginner, especially on glass, so it is almost exclusively recommended for professional users.

3. Bostik Red silicone High Temperature

 
If you want to know where to buy a DIY category silicone that is able to withstand high temperatures once dried, then we suggest you take a look at the High Temperature Silicone produced by the well-known French multinational Bostik.

Bostik Rosso, in fact, has an acetic base and after complete drying it is able to withstand temperatures ranging from a minimum of -60 ° up to + 250 °, with peaks of + 300 ° endured for limited periods of one now at the most; it is also resistant to water, chemical and atmospheric agents, UV rays, does not discolour and maintains its elasticity intact. It is a product recommended above all for gluing the glass of ovens and microwaves, to seal the edges of ceramic cooking plates, the barriers of radiators and pipes where hot fluids pass, such as flues.

Pros

Easy to use: The product belongs to the Bostik line of silicones and sealants for DIY, so it is easy to use even for novice hobbyists. Obviously it is recommended to follow the instructions on the package.

High Temperatures: This is a product specifically designed to withstand high temperatures, therefore it is recommended above all as a sealant for flues and for fixing glass and plates on oven doors.



Red: The red color is made on purpose to allow easy visual feedback on the silicone and check that its condition remains intact over the years; in fact it does not even discolour.

Versus

Expensive: The only flaw is the price; being a silicone with specific properties, in fact, it is characterized by a higher cost than the average.

4. Saratoga SIL3004 transparent silicone sealant 5 pieces

 
If we take into account the cost of this product in relation to the fact that the package contains five tubes of 280 ml each, instead of a single tube, then we are faced with the cheapest of the products examined in our article.

SIL3004 from Saratoga is a specific acetic sealant for glassmakers; in fact, its formula is only suitable for non-porous surfaces and is suitable for both assembly and sealing of windows and windows.

The variant we have examined is the transparent one for universal use, but it is also available in transparent and white colors with anti-mold properties, in case you need to use it to seal or assemble glass and mirrors in humid environments such as the bathroom or the kitchen. The quality and yield of the product are excellent, as is the price, but the spouts are missing in the package so if you don’t have them you have to buy them separately.

Pros

Quality: The Saratoga brand belongs to an Italian company and is synonymous with quality in the sector of silicones, adhesives and other chemicals for construction, mechanics, cars and gardening.

For glassmakers: SIL3004 is specially designed to offer maximum performance on non-porous surfaces, especially glass; for this reason it is mainly used by glassmakers.



Convenient: The package includes five 280ml silicone cartridges; making the calculation, therefore, the unit price for each cartridge is competitive to say the least.

Versus

Spouts: As often happens with silicones, SIL3004 is also sold in a package without spouts, it is also acetic-based so it cannot be painted.

5. Pattex Bagno Sano Silicone Easy white anti-mold sealant

 
The Silicotec technology of Pattex, which has made it possible to synthesize the neutral water-based silicone Bagno Sano, has made this product particularly easy to use. In fact, the 150 ml tube packaging does not require a silicone gun and therefore is especially suitable for DIY enthusiasts; the further advantage of its water-based formula is that once applied it is enough to smooth it with a moistened finger while the residues can be easily removed with a little water.

As the name suggests, Pattex Bagno Sano is mainly intended for use as a sealant in bathrooms, in fact it is white in color and has high anti-mold properties; however, it can be safely used outdoors, as it is resistant to UV rays and atmospheric agents, and also has good adhesion even on porous surfaces. Despite the high cost, it is considered the best silicone among those specific for the bathroom.

Pros

For bathrooms: The technical characteristics of this silicone are also suitable for outdoor use, but it is actually made specifically for use in bathrooms, to seal cracks and joints or to assemble shower enclosures and windows.

Easy to use: The product is meant for both professional and DIY use, so it is also available in an easier-to-use tube packaging, which does not require the use of the gun.



Characteristics: Being intended for use in bathrooms, Bagno Sano silicone has specific characteristics for this environment: it is white in color, so as not to detach too much from tiles, frames and sanitary ware, and it has anti-mold properties.

Versus

Price: Being a silicone for specific use it is more expensive than the standard average, you will hardly find it at low prices unless it is on offer.

6. Weicon Universal Waterproofing Sealant Spray

 
The one produced by the German company Weicon is a silicone spray in a 400 ml can, and in this case it is a high-adherence liquid silicone which, once sprayed on the surfaces, when completely dry, forms a layer of waterproof, weather-resistant and paintable plastic material. .

The Universal Sealant Spray, as its name suggests, is especially suitable for closing cracks, crevices and joints, especially those of microscopic dimensions, and for refurbishing pipes and roofs, whether it is corrugated metal sheets or traditional roofs. It has strong adhesion to almost all types of surfaces, both porous and non-porous, and is also suitable for boats and vehicles.

The spray must be applied in two “coats” at least, first a base coat and then, after it has dried, a second to complete the work; furthermore, the treatment must be renewed every year or two, depending on the case.

Pros

Spray: The silicone in liquid form to be applied by spray is an extremely simple solution and affordable for everyone, even if you have no experience in the DIY field.

Versatile: It can be used on almost all surfaces, porous and non, moreover, being a spray, it is also good on sheaths and insulating rolls, on corrugated sheets and even for vehicles and boats.

Micro-cracks: Weicon Universal Sealant Spray is of great help especially when there is the need to seal or waterproof microscopic cracks and fissures, which would be difficult to treat with normal silicone.

Versus

Duration: Despite the good characteristics and versatility of use, the resistance of the product is limited in time and therefore every year or two it must be applied again.

7. Saratoga Silicone Universal Sealant Transparent anti-mold

 
The Transparent Universal Silicone Sealant produced by the well-known Italian brand Saratoga is another product with a specific intended use; despite having an easily accessible price, therefore, in proportion to the quantity it is still more expensive than the average.

The tube contains only 60 ml of product in fact, and is mainly intended for use on non-porous surfaces, especially glass. Despite its universal character, in fact, this sealant is mainly recommended for windows, hatches, portholes, windows, glass greenhouses and for aquariums, thanks to its anti-mold properties; it is also recommended as an electrical insulator and to seal the rubber bumpers and the gaskets of motorcycle and vehicle headlights.



The only flaw, as mentioned above, is that the tube contains a limited amount of product, so it is convenient only for small jobs, such as aquariums and medium and small windows.

Pros

Easy to use: Saratoga Silicone Sealant in tube does not need a gun to be applied, just do not rush to apply it because the product is thick and needs to be squeezed out slowly.

For aquariums: It has high anti-mold properties and is mainly recommended as a sealant for aquariums, or for application in very humid environments.

Versatile: Obviously it can also be used for other applications, if necessary it is suitable for electrical insulation and gaskets, or for assembling materials such as ceramic and aluminum.

Versus

Expensive: In proportion to the quantity, just 60 ml, the price is quite high; therefore it is only recommended for small jobs.

8. Sika Sikasil C silicone sealant for construction applications

 
We conclude our article with a silicone that ranks last only because it is a product intended mainly for use in the construction field; not by chance, in fact, it is produced by the well-known Italian firm Sika, specialized in the construction field.

Sikasil C is a neutral one-component silicone sealant for building and sanitary applications; its formula is non-corrosive, it is multipurpose and is particularly suitable for elastic joints, as well as for many other joint configurations. It is a professional product of the highest quality, with a power of adhesion that does not require the use of primer; in fact it adheres perfectly to most building materials, resists UV rays, atmospheric agents, mold, fungi and aging.

As mentioned before, however, it is a professional product, so it is more expensive than standard silicones, commonly used in DIY and hobby applications.

Pros

High quality: The Italian company Sika was founded in 1932 and is a brand synonymous with the highest quality in the building and construction sector; Sikasil C, in fact, is a product appreciated above all by professionals.

Elastic: Sikasil C has advanced characteristics in all respects, starting from resistance to bad weather, mold, fungi and extreme temperatures up to elasticity, in fact it is able to withstand movements up to more or less 25% of its mass.



Strong adhesion: Can be applied to almost all surfaces and building materials without the need for primer or other pre-treatments, and has a high adhesion power.

Versus

Price: Compared to standard silicones used in the hobby and home sectors, for DIY and small renovations, the Sikasil C is characterized by a higher price.

How to choose the best silicones

Before choosing which silicone to buy, it is better to inform yourself well about the characteristics of the product; In fact, on the market you can find different types, with equally different characteristics, so let’s go into the topic further.


What is silicone

Silicones are inorganic polymers based on silicon and oxygen linked to organic functional groups; depending on the groups, the length of the polymer chain and its branching, it can assume different consistencies and physical characteristics. In fact, on the market there are liquid, oily or rubbery silicones at various density stages, and therefore intended for different types of applications. Liquid silicone, for example, is mainly used as a lubricant.

Silicones for building use

The type of silicone that interests us most, however, is the one intended for use as an adhesive and sealant in the construction sector; this particular variant is sold in vacuum sealed packs called “cartridges”, because to be used they need a special tool called a silicone gun.

The silicone polymer contained in the cartridges has a more or less creamy consistency but once extruded from the cartridge, in contact with the air, the polymerization reaction is activated, which is divided into two phases: skin time and complete drying. .

The time skin is the one that employs the silicon surface layer to dry, in fact forming a dry film; this depends on several factors, such as the temperature and the percentage of humidity in the air, but generally varies from ten minutes to several hours depending on the type. Complete drying, on the other hand, takes from 24 to 72 hours, depending on the environmental conditions and the type.


The main features

To understand how to choose a good silicone, therefore, you need to know what are the specific characteristics to pay more attention to, especially based on the type of use to be made of it, and be aware that the price of the product takes on secondary importance.

Just to give a practical example, therefore, silicones intended for construction use as adhesives or sealants can be acetic or acrylic based; the importance of identifying the type of composition before purchasing lies in the fact that the acetic-based ones are not paintable while the acrylic-based ones are.

If the silicone is intended for the assembly of a shower enclosure, or to act as a sealant for window frames, then it is advisable to buy one that has high resistance to water, humidity, UV rays and mold. To seal the glass of an oven door, however, it is better to focus on a product whose formula is able to withstand temperatures above 250 degrees.

If silicone is to be used to assemble insulating panels to the ceiling, instead, then it is better to buy one that has a polymerization time of no more than 24 hours, in order to reduce as much as possible the time of use of the props to keep the panels in position. and prevent them from falling before complete solidification.

How to apply silicone

Gun, spray and tubes

The methods of applying silicone vary according to the type of packaging. The most common are rigid plastic cartridges, which are inserted into the special silicone gun; this implements a pressure inside the cartridge, thus extruding the product through a nozzle mounted on the front. A similar method of application, but without a gun, is that of the tube, which is wound starting from the base with the help of a metal key.

In both cases the silicone is extruded from the front end of the container, cartridge or tube, and then this must be moved along the crack to be sealed or on the surface where the silicone is applied. The spray variant is the simplest to apply instead, because it is enough to press the dispensing valve and then direct the spray on the area to be treated.


How to remove silicone from tiles

To remove the dry silicone, you can first use an angle scraper, or a cutter, to remove the excess part protruding from the crack, and then apply a silicone solvent on the remaining part, leaving it to act for a couple of hours before proceed to complete removal.

Alternatively, it is possible to use alcohol, vinegar, acetone or white spirit, which are products that are easy to find and not too aggressive; once you have chosen the product to use, just dab it on the silicone with the help of a rag, leave it to act for half an hour or more and then proceed with the removal.

How to remove silicone from hands

To remove the fresh silicone from the hands, however, just use alcohol or the acetone that is used to remove the polish from the nails. Just apply a little on the stains and then rub it gently with a rag; Once the silicone stains have been removed from your hands, just subject them to a further wash with soap and water.

Frequent questions

How many types of silicone are there?

Silicone can be used for different applications, consequently on the market this substance can be found in different types: adhesives, sealants, insulators, lubricants, wall finishes or additives with special purposes, such as antifoam substances used in industrial processes.

A classic example of lubricating silicones are the oil used for the gears of the treadmill and the silicone grease, used mainly as a lubricant for the contact areas between metal and rubber parts or, thanks to its dielectric properties, for the components of electric motors and contacts, which in this way are not exposed to the risk of short circuits.

The silicones used as adhesives and sealants are in turn available in different types, which differ mainly in the characteristics possessed by the specific formula of the product; some, for example, contain fungicides and are particularly suitable for use in humid environments, while others are characterized by greater resistance to high temperatures.

There are also liquid silicones which are not used as lubricants but as sealants; in this case they are packaged in spray cans and are mainly used for the isolation of microscopic cracks and crevices.


How much does silicone cost?

The price of silicone obviously varies according to the type and its specific characteristics; but usually, with the necessary exceptions, the cost is never excessive. Silicones for DIY, for example, are characterized by a cost that varies from three to eight euros per pack, whether they are cartridges for guns or hoses; in these cases the price increases only based on the number of cartridges contained in each pack.

The only exception, in this case, is represented by spray sealant silicones, which instead tend to be more expensive; the average price of a can, in fact, varies from eight to sixteen euros. Another type of silicone that goes beyond the normal price standards is that resistant to high temperatures; the silicone cartridges belonging to this category, in fact, can cost around twelve to fifteen euros.

The prices indicated are roughly the same both for silicones intended for professional use and for those used in the hobby and amateur fields; in this particular aspect, therefore, there are no substantial differences.

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