Which silicone sealant is the best?

While acid cure is great for working with surfaces such as glass or glazed tiles, it can be too corrosive for other materials, so be sure to check the manufacturer’s label before using. Neutral cure is generally the safest type of sealant when working with wood, plastics or metal. However, it does take slightly longer to cure.

The majority of silicone sealants tend to be multi-purpose but it’s best to choose a specific sanitary silicone sealant for wet applications, such as in the bathroom, as they’re more resistant to mould and mildew. You’ll also need to check whether a sealant is designed to use indoors, outdoors or both.

How long does silicone sealant take to dry?

This varies between products, depending on the specific materials and compounds used in the product. On average, most sealants will be touch dry in one to three hours. We would, however, recommend waiting at least ten hours (and ideally 24) before letting the seal be exposed to any direct water contact. So if you’re using your silicone sealant outside, choose a dry day, even if it’s suitable for outdoor use.

Tips for using silicone sealant

Use a primer where possible – Primers don’t have a very long shelf life, but they can help improve the adhesion of your sealant.

• Shelf life – Silicone sealants won’t keep forever in their tube as once the sealant is exposed to the elements. Keep nozzles attached at all times and if you live in a hot and humid environment, keep your silicone sealant in the fridge.
• Expiration date – Silicone sealants can undergo changes if they’re out of date, will take longer to dry and won’t be as durable once set. Make sure you check expiration dates before you buy or on tubes already opened.
• Clean surfaces – Clean surfaces thoroughly before using sealant, as residues can prevent a solid bond forming. You should also ensure surfaces are dry before application.
• Use pressure – If you’re sealing two pieces of metal together, you’ll need to apply pressure to ensure the sealant forms a strong bond. We recommend using a vice or clamp to hold the pieces together firmly.

How much should I spend?

We’ve got silicone sealants ranging from £5 to £15 below, all of which are highly effective. In fact, we wouldn’t recommend paying more than this unless you’re buying an extra-large tube.

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Glass is commonly used for household and industrial purposes, and it functions best when paired with an appropriate adhesive or sealant. Here’s what to know about silicone sealant for glass and how you can select the right material for your project.

What is Silicone, and Why is it Used With Glass?

Silicone is a synthetic polymer made from silicon, oxygen, carbon, and hydrogen. It's known for its remarkable versatility and durability, which make it a popular choice for glass sealant.

The molecular structure of silicone gives it unique properties (thermal stability, water resistance, and flexibility). These properties are exactly what you should be looking for in a sealant, especially if you’re dealing with materials like glass that can expand or contract with temperature changes.

A silicone adhesive for glass forms a strong bond with glass surfaces, making a waterproof and airtight seal. This elasticity allows silicone to maintain its sealant properties under a wide range of conditions without cracking or becoming brittle.

Also, because silicone sealants are resistant to UV light and weathering, they’re ideal for outdoor glass applications and other high-temperature environments. Silicone adhesives do a fantastic job of resisting yellowing and creating an aesthetically pleasing appearance for door glass.

Silicon Sealant Use Cases

Whether you’re working on a home repair project or improving a public building, silicone glue for glass is your best friend. Here are some of the most common ways silicone for glass is being used today.

Home Window Installation and Repair

Silicone sealants are often used in window repair and installation. Their ability to form a strong seal is key to properly insulating homes and, by extension, improving energy efficiency. Silicone's resistance to weathering ensures the seal remains intact over time, reducing the need for frequent maintenance.

Glass Doors and Partitions

Glass doors and partitions are the bread and butter of modern architecture, as they create a sense of openness while maintaining distinct spaces. Silicone sealants are used to anchor these glass elements in place. Silicon is barely — if at all — noticeable, allowing home and building owners to maintain the sleek, clean look they’re so often going for.

Automotive Windshields and Sunroofs

Who doesn’t love a good sunroof? Silicone sealants are extremely well-suited for cars. With silicone, you don't have to worry about driving in the rain — everything will be held in place. These sealants provide a barrier against water and air, preventing leaks and wind noise.

Aquariums

Silicone for aquarium glass is a great option for those looking to secure their aquariums. However, because of the unique life forms contained in these spaces, it’s important to choose a sealant that is completely non-toxic and safe for aquatic life. It should also be capable of forming a long-lasting bond that remains unaffected by continuous immersion in water.

Skylights and Glass Canopies

Silicone sealants play a crucial role in the installation of skylights and glass canopies. These applications require a sealant that can withstand direct exposure to sunlight and harsh weather conditions without degrading. Silicone's ability to resist UV light and temperature extremes makes it an ideal choice for these overhead glass installations.

Ovens

If you’re repairing or installing an oven, consider using silicone. Silicone for oven door glass is ideal thanks to its high heat resistance. It can withstand extreme oven temperatures without wearing down, saving homeowners possible repair costs down the road. Pairing a silicone sealant with insulating glass is a great way to keep your food warm.

How to Choose the Right Sealant for Your Project

Those in the market for a silicone sealant are in luck — there are numerous options available for various applications. The hard part is choosing between them. No matter what type of project you’re working on, here are some things you should be sure to look for in a sealant:

• Heat Resistance: The best sealants can handle high temperatures. For oven doors or other heat-exposed glass, look for a sealant labeled “high-temperature” or “heat-resistant."
• Type of Silicone: There are two main types of silicone sealants: acetoxy and neutral cure. For glass applications, a neutral cure silicone is often preferred due to its less aggressive nature.
• UV Resistance: Some silicone sealants degrade under UV light, so be sure to look for a UV-resistant formulation to ensure longevity in sun-exposed areas.
• Flexibility and Strength: Silicone sealants are known for their flexibility, which is critical for materials like glass that can expand and contract with temperature changes. Check the product specifications for tensile strength and elongation properties to determine whether or not it can handle the movement without cracking or losing adhesion.
• Certifications and Standards: Look for FDA-approved or NSF-certified sealants if you plan on using them in environments where food is present, such as a restaurant.
• Brand Reputation and Reviews: Opt for brands with a good reputation for quality and durability in sealants. Customer reviews, especially those for similar applications, can provide valuable insight into the product’s performance.
• Color and Aesthetics: While the performance should be top of mind, the sealant's color and finish are also important, especially if you’ll be using them in visible areas. Silicone sealant colors range from clear to black, so make sure to choose one that matches or complements the surrounding area.

The benefits of silicone sealants speak for themselves, but to achieve best results, it’s important to choose one that’s well-suited to your needs. By weighing all of these factors together, you can find the sealant that’s right for your project — and create something that will last for years to come.

Silicone Depot offers quality sealants for a variety of use cases. Browse our offerings to learn more about our sealants and find the product that meets your needs!