Plumber’s putty is a soft, moldable sealant used to create a watertight seat between a fixture flange and the surface it sits on. It’s commonly applied under sink strainers, faucet bases, and tub/shower drain flanges.

• Helps prevent seepage around non-pressurized joints.
• Stays pliable for easy adjustments and future removal.
• Fills small gaps where rigid gaskets may not sit perfectly.

1. Clean and dry both surfaces.
2. Roll a rope of putty and place it around the flange.
3. Press and tighten the hardware evenly; trim excess.
4. Run water and check for moisture.

It’s not an adhesive and doesn’t harden like glue, so it’s best for fixture seating rather than structural repairs. Always follow the product’s directions; results can vary based on materials and installation.

There are situations where plumber’s putty isn’t the best choice, because it’s non-hardening and not a bonding agent.

• Pressurized lines or active leaks: It’s not designed for pressure; consider a mechanical or code-compliant repair.
• Threaded connections: Threads are typically sealed with thread sealant tape or paste, not putty.
• Porous or stain-prone surfaces: Natural stone, concrete, or unsealed surfaces can discolor from traditional putty; a stain-free formula or another compatible sealant may be preferable.
• Submerged or flexing joints: Constant movement or immersion can disrupt the seal.
• Places needing strong adhesion: Putty won’t bond or reinforce damaged parts.

Check your fixture and surface manufacturer guidance to choose a sealant that’s compatible with your materials and use case.

Plumber’s putty can help if a slow seep is coming from the seal under a fixture flange—like a sink strainer or faucet base—rather than from the pipes themselves. It’s meant for creating a watertight seat, not repairing cracks or pressurized joints.

1. Shut off water and dry the area.
2. Disassemble the flange as your fixture instructions describe.
3. Remove old sealant and clean surfaces.
4. Apply a fresh rope of putty, reassemble, and tighten evenly.
5. Wipe excess and test with water, watching for moisture.

If the leak continues, the cause may be a worn gasket, warped parts, or a pipe connection that needs a different sealant or replacement. Choosing the right approach can help, but results may vary with condition and installation.

In a calm, non-pressurized setting, a properly applied plumber’s putty seal can last for years, but longevity depends on surface prep, movement, and exposure to cleaners and water.

• Because it remains pliable, bumps or over-tightening can disturb the seal over time.
• On some materials, traditional formulas may cause staining; stain-free options can help on sensitive surfaces.
• Periodic checks and gentle re-tightening may help maintain performance.

Signals it’s time to refresh include dampness around the flange, wobble at the fixture base, or discoloration. The benefit of putty is that it’s removable, so you can clean and reapply when needed. Always follow product directions and your fixture maker’s guidance; results can vary by installation.

They serve different jobs and behave differently after application.

• Plumber’s putty: A non-hardening sealant for seating fixture flanges (drains, faucets). It’s easy to shape, remove, and adjust, but it isn’t an adhesive.
• Epoxy putty: A two-part compound that cures hard to fill, patch, and bond on many materials. Some formulas can be applied to damp surfaces and may be sanded or painted after curing.

Choose based on the task: use plumber’s putty to seal a drain flange; consider epoxy putty to rebuild a chipped area or fill a small, non-pressurized gap. For active or pressurized leaks, shutting off water and pursuing a code-compliant repair is advisable. Always review label directions for material compatibility and cure times; outcomes can vary.