To prevent gun rust from humidity, keep the gun clean, wipe it with a light film of oil, and store it where the air stays dry. Georgia makes this harder than most places, because summer nights here are close to saturated. Rust needs moisture on steel. Your job is to take that moisture away.
This post shows what the weather data says about Georgia, why humidity matters for steel, and a simple plan you can follow at home. It is general care advice, not a promise about any one gun.
Why Georgia Humidity Matters for Guns
Humidity is the amount of water vapor in the air. The more there is, the easier it is for a thin layer of moisture to settle on bare metal.
The National Weather Service explains it with the dew point. In its words, the dew point is the temperature the air must cool to in order to reach 100 percent relative humidity, and a higher dew point means a more humid, muggier day. You can read its dew point explainer for the full idea.
Now look at real numbers. NOAA’s 1991 to 2020 hourly climate normals for Atlanta’s airport station, called Hartsfield, give these figures at 5 AM:
| Day | Normal air temperature | Normal dew point |
|---|---|---|
| July 15 | 72.9 F | 68.5 F |
| January 15 | 38.9 F | 31.5 F |
You can pull the same figures from NOAA’s climate normals data service. On a July morning the air temperature and the dew point sit only about 4 degrees apart. That means the air is close to its limit for holding water. On a January morning the gap is about 7 degrees. Cumming is not at the airport, so your exact numbers will differ, but the pattern is a good guide to how muggy a Georgia summer feels in a closet or a garage.
What Humidity Does to Steel
Metal always has a thin layer of water molecules on its surface. The Canadian Conservation Institute, which studies how to protect museum collections, says that layer grows quickly above 75 percent relative humidity. It also says that in general, for metals, the lower the humidity the better, and that above 75 percent all corrosion speeds up a lot.
It adds a point that matters for hands. Salt on a metal surface can form a very corrosive liquid once the air passes 75 percent relative humidity. Sweat has salt in it, so a bare steel part that you handled and put away damp is a good place for rust to start.
This is museum guidance for old metal objects, not a gun-storage standard. It is still a useful rule of thumb: drier is better, and clean metal does better than metal with salt on it.
A Simple Plan to Keep Guns From Rusting
You do not need a lot of gear. These steps cover most of it.
- Wipe the gun after you handle it. A dry cloth takes off sweat and fingerprints. This is the cheapest rust prevention there is.
- Add a thin film of oil to bare steel. A light wipe is enough. Too much oil attracts dust and can stain a case. Not sure which product to use? See gun oil vs CLP.
- Store in a closed space where you can control the air. A safe, a cabinet or a lockable case holds less moving air than an open rack.
- Cut the moisture in that space. A dehumidifier in the room or a desiccant pack in the safe both work on the same idea: lower humidity. Check or replace desiccant on a schedule, because it fills up.
- Measure it. A small hygrometer reads the humidity in your safe or cabinet. If it creeps up, you will see it before you see rust.
- Check your guns now and then. Look at the bore, the slide rails, the screws and the barrel crown. Rust likes hidden spots.
A few things to watch for:
- Damp cases and holsters. A foam-lined case or a leather holster can hold moisture against the metal. Do not put a gun away in one right after a wet day. Let the gun and the case dry first.
- A garage or an outbuilding. These spaces swing between hot and cool. When metal is cooler than the dew point of the air around it, water can form on the surface. Move a gun you care about to a space inside the house.
- A basement. Basements are often damp. If a gun lives there, add a dehumidifier or a hygrometer to see what the air is doing.
Safe Storage and Dry Storage Go Together
A locked, closed safe or cabinet does two jobs. It keeps the gun secure, and it gives you a small space to keep dry. We cover the locked storage side in safe gun storage at home.
Pick a place you can reach easily for a quick check, but that a child or a visitor cannot reach. Then add the dryness steps above to the same spot.
What to Do if You Find Rust
Surface rust is a thin orange or brown film. It can often be wiped or cleaned off if you catch it early. Deeper rust, with pitting that you can feel with a fingernail, is harder. Pits are tiny holes in the steel, and cleaning does not fill them.
If you see rust, take a few simple steps:
- Make the gun safe, then look it over in good light.
- Dry it and keep it in a dry space until you can have it looked at.
If you are not sure how bad it is, bring it in. At Lakeside Munitions, surface rust cleanup is included during a cleaning, to the best of our ability. Cleaning is posted at $35 on the gunsmithing price list, or $25 if you bought the gun at our shop. Deeper pitting is something to ask about up front. For more on what can and cannot be brought back, see can a rusty gun be restored.
A Quick Monthly Check
Put a reminder on your phone and run through this list once a month in summer, and every few months the rest of the year.
- Read the hygrometer, if you have one, and note any climb.
- Check the desiccant pack or the dehumidifier tank.
- Open each case and look for damp foam or a musty smell.
- Look at the bore, the rails, the screws and any bare steel for orange or brown spots.
- Wipe each gun with a dry cloth and add a thin film of oil where it is needed.
The whole check takes a few minutes per gun, and it is far cheaper than a refinish.
Make it a habit. Rust prevention is a routine, not a project. Wipe the gun after you handle it, keep a thin film on bare steel, keep the storage space dry, and check in now and then. In Georgia, do it more often in summer.
If you want help, walk in, no appointment needed. We are at 211 Atlanta Rd in Cumming, open Tuesday through Friday 10 to 6 and Saturday 10 to 5. See the gunsmithing page for the price list, or send us a message with your question.
