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Spray Silicone Sealer: Your Right Choice for Electronics Application

Electronics systems use Spray Silicone Sealer to protect against moisture, heat, and UV light. This article will help you choose the right type of spray silicone sealer for your electronics application.

What Is Spray Silicone Sealant

Silicone is an adhesive found in liquid, resin, grease, paste, or rubber form. Most users dispense silicone from a tube or brush it onto a surface. However, some applications need a uniform, thin layer of silicone and high levels of flexibility. 

In some electronic applications, the circuit boards or cable harnesses are flexible. While in others, the areas to protect are challenging to access. Hence, these applications use spray silicone sealer dispensed as a fine spray from a pressurized spray can.

Spray Silicone Sealant Common uses

Spray Silicone Sealant

You will find spray silicone sealers in industrial applications and construction. Some common uses for silicone sealer spray include: 

  • Marine and automotive applications to prevent rust
  • Aerospace systems as a sealant
  • A sealant for electronic circuit boards, connectors, sensors, and components
  • Protection for cable runs. 
  • Lens mold in LED applications
  • A lubricant in metal to non-metal interfaces
  • Protecting and repairing rubber gaskets. 

How To Pik The Best Silicone Sealer Spray

Silicone Sealer Spray

Factors to consider when choosing the best spray silicone sealer are:


What is essential in your application? Is it moisture resistance, heat resistance, or UV light resistance? Choose a silicone spray sealer that matches your requirements. 


Are silicone flexibility and stretch important? If so, you should choose silicone with a low modulus.

In-Service Life

If you need the silicone coating to protect you over the long term, it is generally best to choose a low modulus silicone. 


The type of silicone should match the electronics board, components, or connectors you intend to protect. If there is a mismatch in materials, the silicone may not stick properly and fail to provide a seal. 

Time to cure

Some silicones cure faster than others. This time can be crucial in electronic production lines as it causes a delay. But remember, fast-curing materials may not have the required adhesion or modulus. 


Most electronic applications use a clear silicone sealer spray, but black and white are also available. 


It is always essential to consider cost versus functionality. 

Spray Silicone Sealer: What’s The Difference Between Silicone And Sealant

Silicone and sealant use different

Silicone and sealant use different base materials. The adhesive is acrylic-based and used in construction for sealing gaps and making joints. It is essential to avoid exposing adhesive to water.

You can paint acrylic sealant but not silicone. In contrast, silicone is water-resistant. It is also more flexible and lasts longer than acrylic. 

 Spray Silicone Sealer: Are All Silicone Sealants Waterproof

All pure silicone sealants are waterproof and will remain so for twenty years. However, exposure to chemicals or excessive heat can damage the silicone and allow moisture. 

Mechanical damage to the sealant is also a potential problem. For this reason, spray silicone sealer is often used to repair damaged coatings. 

Spray Silicone Sealer: What Is The Best Sanitary Silicone Sealant

The composition of sanitary silicone sealant makes it resistant to mold. Hence, you will find it as a sealant around sinks, kitchens, and bathrooms in the home. When looking for a sanitary silicone sealant, you should consider: 

Anti-mold and mildew properties

Home Depot stocks many silicone spray sealant products. Avoid cheaper brands as they have poor anti-mold properties. Reputable brands include Bostik, Loctite, Electrolube, Uni-bond, Evo-Stik, and Henkel. 


Silicone sealants can degrade and discolor over time. Again, a trade-off is necessary between price and quality. 

Spray Silicone Sealer

Dry times

Some silicone sealants dry within a few hours. Others can take up to 2 days. 


Electronic circuit boards and components must continue to operate in high temperatures, high humidity, and corrosive environments. 

Therefore, It is vital to carefully choose protective coating materials for electronic systems. One option is spray silicone sealant. 

It is easy to use, delivers a consistent finish, and allows circuit boards, cables, and connectors to flex. Please get in touch if you need any help selecting a silicone coating material.

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Emma Lu
Our professional engineering support saves our customers a lot of trouble and loss. >>>>>> After you place the order, our engineer will conduct technical reviews to make sure the parts can be mounted well/correctly on the boards. We will check if the component packages match well with the Gerber footprints, if the part numbers you provided match well with the descriptions, and if the polarity is clearly marked. >>>>> When your design is ready, please send your Gerber and BOM so we can quote and start!