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Does Silicone Stick to Metal?

Does Silicone Stick to Metal?

Jul 6th 2023

Many contractors and home improvement gurus use silicone sealants to complete their projects. Why?

  • Silicone sealant can be used on many types of surfaces, indoors or outdoors.
  • It can withstand extreme temperatures and humidity levels, making it perfect for high-temperature environments and outdoor applications.
  • Silicone sealant also resists certain harsh chemicals and is waterproof.
  • It boasts a long life cycle due to its resistance properties.
  • Anyone can easily apply it without special tools or techniques.

Several questions remain to be answered: does silicone stick to metal? If so, what are some tips to ensure maximum adhesion?

Read on to find out!

Does Silicone Sealant Stick to Metal?

Yes, silicone sealant sticks to metal!

Silicone sealant has a wide range of applications across various industries due to its chemical-resistant and water-repellent properties. It's not just limited to household use where you can use it to seal gaps around windows, doors, sinks, bathtubs, and other areas. Silicone sealant plays a significant role in construction by bonding surfaces like glass, plastic, and metal together. You can apply silicone sealant on aluminum, brass, steel, and copper, four common metals you’ll come across in many construction and home improvement projects.

When Would I Use Silicone Sealant on Aluminum?

Silicone sealant adheres exceptionally well to aluminum surfaces, ensuring a tight seal that keeps out moisture and air. Silicone sealant seals gaps or joints in aluminum structures like windows, doors, or aluminum frames. Silicone sealant acts as a protective shield, guarding aluminum surfaces against corrosion, chemicals, and weathering.

However, sealant that contains acetic acid could corrode aluminum. Always use silicone sealant that does not contain this chemical.

Tips for using silicone sealant on aluminum

  • Follow the instructions: Different products may have slight differences in application techniques and drying times.
  • Use the right type of sealant: Use a non-acetic acid sealant.
  • Clean and dry the surface: Use a mild detergent and water to remove dirt, dust, grease, or other contaminants.

When Would I Use Silicone Sealant on Brass?

You’ll find silicone sealant used the most on brass fixtures or fittings like faucets, valves, or pipes. Silicone sealant prevents water leaks like a boss. It also offers protection against tarnishing and corrosion, keeping brass looking great and durable.

Tips for using silicone sealant on brass

  • Test compatibility: Apply a small amount of sealant to an inconspicuous spot of brass before using it all over.
  • Prime the brass surface: Primers often strengthen silicone sealant’s bond on brass, especially if the brass has been treated or coated.
  • Wear goggles: You’ll probably be close to brass fixtures so protect your eyes from any sudden sealant splashes.

When Would I Use Silicone Sealant on Steel?

You’ll probably use silicon sealant on steel structures like metal roofing, steel panels, or steel pipes. It’s very effective in keeping out water, air, and other substances. You should definitely use silicone sealant if you're working on projects that require resistance to high temperatures or chemicals. So don’t hesitate to use a tube on stainless steel!

Tips for using silicone sealant on steel

  • Use a steel-specific sealant: Choose an adhesive that is specifically formulated to handle the stress caused by the expansion and contraction of steel.
  • Degrease the steel surface: Degreasers and solvents make steel surfaces residue-free, which helps sealants form strong bonds.
  • Use a backer rod: A backer rod is a cylindrical foam material that you place in the gap before applying the sealant that fills the void and prevents the sealant from sagging.

When Would I Use Silicone Sealant on Copper?

People often use silicone sealant on copper on plumbing projects. They rely on the adhesive to bond copper pipes or fittings. The sealant also prevents corrosion and oxidation, helping to preserve the copper's appearance and longevity.

Tips for using silicone sealant on copper

  • Consider copper-specific sealants: These specialized adhesives are designed to offer excellent adhesion and compatibility with copper, guaranteeing a reliable and long-lasting seal.
  • Apply a thin layer: Due to copper's high conductivity and rapid heat transfer, applying a thin layer of sealant enables improved heat dissipation.
  • Be patient: Give the sealant enough time to cure according to the manufacturer's recommendations before exposing it to moisture.

When Would I Use Silicone Depot?

Be confident when using silicone sealant on metal. In fact, you don’t have to look far to find materials for silicone sealant to stick to. The power of silicone adhesion makes sealing metal and other substances a breeze. You can use silicone sealants on:

  • Glass surfaces: Perfect for sealing windows, aquariums, and glass panels.
  • Ceramics: An excellent choice for bathroom fixtures and tiles.
  • PVC and acrylic plastics: Dependable for plumbing connections.
  • Concrete: Invaluable in the construction industry.

Get the job done right the first time. Only use sealants you can trust.

Where can you find the best and most affordable silicone sealant?

Silicone Depot has all the silicone sealant products and accessories for nearly any project you can imagine. We offer a wide selection of top-quality brands at competitive prices. Whether you require bulk sealant for a construction project or simply need a few tubes, we can be the source you always turn to.

Our expertise extends past our popular products. You can explore our blog to discover silicone sealant uses you might have overlooked. In addition to silicone uses, you can learn about various applications, tips, and techniques for mastering silicone sealants. If you’re already a pro, you might pick up something new. If you’re not one, then you could be in no time at all.


We want you to stay informed, inspired, and discover new possibilities! Get in touch with us if you have any questions.