Plumber's putty vs. silicone: Which one should you use?

Understanding plumber’s putty.

Plumber’s putty is a moldable substance with the consistency of modeling clay. The putty prevents water from leaking out of sink drains, tubs, and other fixtures by filling in cracks and crevices. 

Rather than adhering to materials, plumber’s putty sets around the fixture, creating a watertight seal. Unlike silicone caulk, this putty stays soft and malleable if protected. However, it can become hard and brittle with prolonged air exposure.

Benefits of using plumber’s putty.

Plumber’s putty offers several benefits in comparison to silicone sealants, including:

• Quick curing time. Because it stays soft, you can use the fixture immediately after application in most cases.
• Easy to clean. It doesn’t stick to hands and is easy to clean up. 
• Allows for alteration. You can modify it after the initial application.

Related: How long does plumber's putty take to dry?

Tips for using plumber’s putty effectively.

When using plumber’s putty, do:

• Clean the surface area before application.
• Make sure the material is suitable for putty.
• Keep the putty container sealed when not in use.

You should avoid the following when using plumber’s putty. For example, don't:

• Use it on plastics like acrylic or porous surfaces like stone.
• Use it to seal a pressurized connection.
• Use it on threaded joints.
• Leave the putty exposed to air.
• Re-use plumber’s putty that has hardened.

Exploring silicone as an alternative.

Unlike plumber’s putty, silicone sealants are adhesive. This product is most commonly sold in a tube with a pointed applicator. It comes out of the tube as a liquid and cures to form a hardened, rubbery seal. Silicone generally takes about 24 hours to dry completely.

Advantages of silicone.

Silicone is a better option for some plumbing projects, offering the following advantages:

• Versatility. It's suitable for metal, plastics, stone, and other materials.
• Durability. The cured seal stands up to weather and UV rays.
• Adhesiveness. Silicone forms a glue-like bond with fixtures.

Tips for using silicone effectively.

When you use silicone instead of plumber’s putty, you should keep the following in mind:

• Use a primer first to yield better results.
• Use the right amount. Be careful not to apply too much sealant.
• Silicone will eventually dry inside the tube. Use it before it does.
• Remember that silicone needs to cure for about 24 hours. Don’t expose the sealant to moisture until it’s completely dry.

Plumber’s putty vs. silicone comparison chart.

Choosing the right option for your plumbing needs.

When deciding between plumber's putty vs. silicone, consider these factors before making your choice:

• Determine which sealant is compatible with the fixture material.
• Consider what you’ll use the fixture for and choose accordingly.
• Silicone often dries clear, which may be preferable if the seal is exposed.

Common uses for plumber’s putty include sink drains, faucets, and shower and bathtub drains. Silicone sealants are best for sink strainers, pop-up drain attachments, and tubs/sinks made of stone or plastic.

When to DIY vs. hire a professional.

Many small plumbing repairs involving plumber’s putty or silicone are DIY-friendly. Projects like caulking and replacing a sink or faucet fixture are relatively simple. However, for any plumbing project that involves significant pipe damage, it’s usually best to hire a professional plumber on Thumbtack.

The Thumbtack app makes it easy to search for professionals in your area and read their customer reviews. Download the app today to get a free quote.

FAQs.

When should you not use plumber’s putty?

Most plumber’s putty is oil-based, meaning it will stain porous surfaces like stone and porcelain. It can also degrade fixtures made of plastics (like acrylic and ABS) and cause failure. And because it isn’t an adhesive, plumber’s putty isn’t suitable for pressurized connections.

Can you use silicone on a sink drain?

Yes, silicone sealants are safe for use on sink drains. However, silicone takes about 24 hours to dry completely. So, don’t expose the seal to moisture until it has finished curing.

Should I use plumber’s putty or silicone on a shower drain?

Plumber’s putty is suitable for shower drains in most cases. However, if you have an acrylic or ABS shower, you should use a silicone sealant, as plumber’s putty can damage plastics.