can you mix anaerobic sealant with silicone


Can You Mix Anaerobic Sealant with Silicone?

When it comes to sealing and bonding applications, using the right products is crucial. Anaerobic sealants and silicone are two popular choices in the industry, each with their own unique properties and strengths. However, many users wonder if these two substances can be mixed together for a specific application. In this article, we will explore the compatibility of anaerobic sealant and silicone and provide guidance on when it is suitable to mix these products.

Understanding Anaerobic Sealants

Anaerobic sealants are specialized adhesives that cure in the absence of air. These sealants are typically used for locking and sealing threaded fasteners, preventing leakage and loosening over time. They are commonly used in applications such as plumbing, automotive, and manufacturing industries.

Anaerobic sealants work based on the principle of oxygen exclusion. When applied between metal surfaces, the sealant remains in a liquid state. However, when it is confined and deprived of oxygen, it starts to harden and cure, creating a strong bond between the surfaces.

Exploring Silicone Sealants

Silicone sealants, on the other hand, are widely used in various industries for their excellent adhesive and sealing properties. They can bond to a wide range of materials, including glass, metal, ceramics, and plastics. Silicone sealants also offer good resistance to heat, chemicals, and weathering, making them versatile and durable in different environments.

Silicone sealants are available in different formulations, including acetoxy and neutral cure types. Acetoxy-curing silicone sealants release acetic acid during the curing process, which can corrode certain metals like copper and brass. Therefore, neutral cure silicone sealants are often preferred in applications where metal compatibility is important.

Can Anaerobic and Silicone Sealants be Mixed?

In general, anaerobic and silicone sealants are not designed to be mixed together. While they both serve the purpose of sealing, they act differently during the curing process. Anaerobic sealants cure by the exclusion of air, while silicone sealants cure through exposure to air's moisture.

When these two types of sealants are mixed, it can interfere with their individual curing mechanisms. The presence of silicone in the mixture inhibits the curing process of the anaerobic sealant, preventing it from hardening properly. As a result, the bond may not achieve its desired strength, and the seal may fail over time.

Additionally, the combination of anaerobic and silicone sealants can affect their adhesive properties. These sealants are designed to bond with specific materials and surfaces. Mixing them together might compromise their adhesive capabilities, leading to weakened bonds.

Application of Mixing Anaerobic Sealant with Silicone

While the general recommendation is to avoid mixing anaerobic and silicone sealants, there are specific scenarios where their combination might be acceptable. It is crucial to understand the compatibility of the sealants based on the application requirements and the intended surfaces.

1. Metal Contact Areas: In certain applications, silicone sealants can be used to seal the area surrounding the metal contact points where anaerobic sealants are applied. This allows for a moisture and corrosion-resistant seal while maintaining the integrity of the anaerobic bond.

2. Non-Critical Applications: If the application does not require high strength or resistance to vibration and chemicals, a combination of anaerobic and silicone sealants can be used. However, it is essential to conduct thorough testing to ensure the compatibility and effectiveness of the mixture for the specific application.

3. Custom Formulations: In some cases, manufacturers offer custom formulations that combine anaerobic and silicone properties. These specially designed sealants provide the benefits of both products without compromising the performance.

4. Sequential Application: Instead of mixing the sealants, another approach is to apply them sequentially. First, the anaerobic sealant is used to create the desired bond, followed by the application of silicone sealant to provide waterproofing or sealing properties.

5. Seek Expert Advice: When unsure about using a mixture of anaerobic and silicone sealants, it is important to consult with industry experts or the manufacturers themselves. They can provide specific recommendations based on the application requirements, ensuring the best outcome.


In conclusion, anaerobic sealants and silicone sealants serve different purposes and have distinct curing mechanisms. Mixing these two substances together is generally not recommended as it can hinder proper curing and compromise the performance of the sealants. However, in certain scenarios and with expert guidance, a combination of the two may be suitable for specific applications. It is crucial to thoroughly evaluate the compatibility and effectiveness of the mixture before using it in any sealing or bonding project.


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