When you’re dealing with plumbing repairs in Anchorage, Alaska, materials matter just as much as the method. And few materials are as commonly used—but often misunderstood—as plumber’s putty. Homeowners and DIYers in the Last Frontier often ask: Does plumbers’ putty go bad?
The short answer is yes, but knowing how and when it happens is crucial to avoiding costly leaks or failed installations. Whether you’re installing a faucet in your Anchorage home or fixing a leaky drain during the winter, understanding how plumber’s putty behaves in Alaska’s climate can save you a lot of trouble.
In this guide, the team at 907 Heating & Plumbing breaks down everything you need to know—from the shelf life of plumber’s putty to proper storage in cold temperatures. If you want plumbing that holds up in Anchorage’s harsh weather, keep reading.
What Is Plumbers’ Putty?
Plumbers’ putty is a soft, flexible sealing compound used to create watertight seals between plumbing components. It’s most often applied under faucets, sink strainers, and drains to prevent water leakage.
Unlike silicone or caulk, plumbers’ putty remains pliable over time, making it ideal for fixtures that may shift or require disassembly. For residents in Anchorage, where freezing and thawing can cause minor plumbing movement, using a flexible sealant like this can be a real advantage.
Does Plumber’s Putty Go Bad? Yes, It Can Go Bad Over Time
Plumber’s putty doesn’t have a strict expiration date stamped on the container, but it can dry out, harden, or crack if stored improperly, especially in climates like Anchorage, where garages or tool sheds can experience extreme cold during winter.
How Long Does It Last in Anchorage?
Unopened plumber’s putty can last 2–5 years when stored at a consistent room temperature. But in Anchorage, where winter temperatures often drop below freezing, storing it in an unheated shed or truck can reduce its shelf life significantly.
Once opened, the lifespan depends on how well it’s sealed and where it’s kept. In colder areas, it may dry out faster if not properly sealed and insulated.
Signs Your Plumbers’ Putty Has Gone Bad
Not sure if your putty is still good? Here are signs it may no longer be safe to use:
1. Dry or Crumbly Texture
Fresh plumber’s putty should be soft and moldable. If it’s brittle or hard, it won’t form a proper seal, especially important in Anchorage homes, where plumbing systems are tested by fluctuating temperatures.
2. Visible Cracks
If it cracks when you roll it or apply it, that’s a sure sign it’s lost its flexibility.
3. Separation or Oiliness
Sometimes oil may rise to the surface in cold environments. This doesn’t always mean it’s bad—you can try kneading it back in. But if the putty remains grainy or uneven, it’s likely expired.
4. Foul Odour
While plumber’s putty naturally has a mineral smell, an off or sour odour can mean it’s spoiled or contaminated.
How to Store Plumbers’ Putty in Alaska’s Climate
Proper storage is the key to longevity, especially in extreme weather conditions like those in Anchorage, AK.
- Store Indoors: Keep your plumber’s putty in a heated indoor space, away from freezing temperatures.
- Seal the Lid Tightly: Exposure to air causes it to dry out faster. After every use, make sure the lid is on tight.
- Avoid Sunlight or Heat Sources: While cold can damage putty, so can excessive heat. The room temperature is ideal.
- Use a Plastic Wrap Barrier: Wrapping the putty in plastic wrap before placing it back in the container adds a layer of protection.
Pro Tip for Anchorage Winter Plumbing Maintenance: Check your plumbing materials each season to ensure everything, from putty to pipe insulation, is in top shape before temperatures plummet.
Can You Revive Old Plumbers’ Putty?
Sometimes! If it’s only slightly stiff and hasn’t completely dried out, you may be able to bring it back to life.
Reviving Instructions:
- Add a few drops of mineral oil.
- Knead thoroughly until the texture softens.
- Test it on a surface to check for pliability and sealing strength.
Anchorage Tip: Cold putty takes longer to revive. Let it warm up to room temperature before kneading for best results.
When to Replace Your Plumber’s Putty
In certain situations, it’s better to skip revival and use a fresh batch, especially for high-stakes plumbing work.
Replace if:
- It’s over a year old and has been exposed to freezing temperatures.
- You notice cracking or crumbling.
- It no longer sticks or seals surfaces properly.
- You’re working on high-pressure water lines or key fixtures.
Using compromised putty in your Anchorage home’s plumbing system can result in leaks, mould, and costly water damage, especially when pipes are under stress during the winter months.
Best Alternatives for Plumbers’ Putty in Anchorage
Depending on the job, you may want to consider these alternatives:
1. Silicone Caulk
Excellent for permanent waterproof seals, particularly around sinks or bathtubs. It adheres well in colder climates like Anchorage.
2. Pipe Thread Sealant (Teflon Paste)
Ideal for threaded metal pipe joints. It holds up well in freezing conditions.
3. PTFE Tape (Teflon Tape)
Best for threaded connections. Easy to apply and effective for indoor plumbing.
4. Non-Staining Putty
Safe for stone surfaces like granite or marble, commonly used in higher-end Anchorage homes.
Common Questions from Anchorage Homeowners
Can I use plumber’s putty outdoors in Alaska?
It’s not ideal. The compound isn’t designed for freezing temperatures or UV exposure. For outdoor plumbing in Anchorage, opt for weather-resistant silicone sealants.
Is it safe to use plumber’s putty on PVC pipes?
Generally no. Use PTFE tape or pipe thread sealant for plastic pipe connections.
Will expired putty still work temporarily?
Maybe—but if you live in Anchorage, where leaks can cause significant damage quickly, it’s best to replace it.
Final Thoughts: Don’t Let Expired Putty Sink Your Project
So, does plumber’s putty go bad? Yes, and if you live in a place like Anchorage, Alaska, it’s even more important to store and use it correctly.
Don’t take chances with old, dried-out material. Whether you’re sealing a new sink or repairing a leak, using high-quality, fresh materials is the key to a long-lasting plumbing job, especially in a state where winter can test even the strongest systems.
Need help with a tricky repair or installation? Contact the pros at 907 Heating & Plumbing—your trusted plumbing experts in Anchorage, Alaska.
Need a Plumber in Anchorage?
At 907 Heating & Plumbing, we’ve seen every plumbing problem Anchorage can throw at us—from frozen pipes to leaky sinks. If you’re unsure about the condition of your plumber’s putty or need expert advice, give us a call or request a free estimate.