Can You Use Silicone To Waterproof Electrical Connections?

Yes, you can use silicone to waterproof electrical connections.

Silicone creates an extremely tight and long-lasting seal while retaining its flexibility; that’s why it’s one of the best materials to waterproof electrical connections.

In addition to being waterproof, it can also withstand extreme weather and high temperatures. 

can you use silicone to waterproof electrical connections

What Type Of Silicone Should Be Used On Electricals?

Silicone products that are in the form of tapes and RTV sealants can be used on electricals and are usually used to seal electrical connections.

These types of silicones are made for electrical connections and are commonly found in boxes with circuit boards to make them impenetrable by water. 

silicone tape sealant

Even if these silicones are water and weatherproof, they are still subject to mechanical wear.

That’s why when using them, you should try to cover it with a non-conducting heavier cover and shrink wrap to protect silicones used to join applications. 

Be careful when buying silicones for electricals.

Other forms are not designed to handle electrical applications, although they can still take some voltage.

That’s why you should only use tapes or RTV sealants to waterproof electric connections. 

Is Wet Silicone Conductive?

Silicon is a semiconductor, which means that it can still conduct some electricity.

However, unlike typical metals, silicone becomes better at conducting electricity as temperature increases.

At the same time, metals get worse at conductivity at higher temperatures. 

Can You Use Silicone Spray-On Electrical Connections?

No, you can’t.

Don’t use silicone spray on any electrical connections, relays, switches, and other electrical applications.

Many users reported that silicone spray-on could cause contact problems on switches, so it’s best to keep it away from any electrical product. 

Silicone sprays contain various ingredients that could cause damage and conduct electricity.

That’s why it becomes a real problem if it gets into connections and plugs.

So if you have one, keep it away from electrical connections to avoid any accident or issues. 

Can You Use SIlicone To Waterproof Outdoor Electrical Connections?

Yes, you can use silicones such as tapes and RTV sealants on your outdoor electrical connections.

So if you want to waterproof outdoor (even indoor) cables, silicone tapes and sealant is the best protectant to use.

The best part? You can easily find them in any hardware or improvement store. 

How To Use Silicone To Waterproof Electrical Connections:

If you’re planning to waterproof electrical connections, follow the guide below. 

Things You’ll Need

  • 7/16 inch wrench
  • Wet rag
  • Silicone sealant


  • Ladder 
  • Paintbrush


  1. If required, mix the silicone sealant. Silicone sealants are made from different compounds, so some brands may need you to mix them before use. 
  2. Remove all the power from the electrical cables you’ll be working with. You can either flip the power switch on your main switch breaker or unplug them from the outlet. 
  3. Clean the housing of all the electrical cables you want to waterproof using the wet rag. There shouldn’t be any dirt, dust, or any other debris on them. 
  4. Using your hand, tighten the cable connectors with a 7/16-inch wrench. Ensure that they’re tight as they can be. 
  5. Next, apply the silicone sealants to the cables. If the sealant comes in a tube inserted in a caulking gun, ensure that it is applied and coated evenly to the wire. If it comes in a tub, use the small paintbrush to apply. 


  • If you’re working with hard-to-reach cables, a ladder can make your work easier. Be sure to have an assistant ready to keep the ladder steady. 
  • If you can wait until spring or summer to seal your electrical cables, wait instead of doing them during colder temperatures. Silicone dries and hardens quickly during mild, pleasant days. 


Silicone can waterproof your electrical connections.

However, you need to be careful when buying one and only purchase those that are made for electrical applications.

If you buy the wrong type, you might end up harming your connections, which can lead to accidents. 

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