How to prevent rust in tool storage

For anyone who relies on good tools, rusting is one of the most annoying problems.

You may have bought these tools brand new. You then store them and then find patches of brown rust forming on the metal. Rusting occurs when moisture and oxygen come into contact with the metal, but you can prevent rusting by paying attention to cleaning, protecting and storage of your tools.

Rust prevention doesn't have to be complex, it comes down having the right type of storage.

Store Tools “Clean”

Hand tools often go from the job to stored. Dirt, sawdust and even your fingerprint will hold moisture against the stainless steel metal. Before putting tools away, always wipe the tool clean. If the tool is wet allow to dry fully. Even tiny amount of trapped moisture can cause corrosion within a sealed tool box or storage area. If you notice early rust, get rid of it with a fine steel wool or mild rust remover before you store the tool.

Use a Protective Coating

Adding just a small amount of protective coating will make a big difference on the tools metal surfaces. Some people like to use light machine oil, mineral oil, or purpose rust inhibiting oil.

Only a very small amount is needed so the tool feels “sticky” to touch. For tools that you seldom use, paste wax can provide a protective barrier to keep moisture away while being free dust free. Some individuals utilize anti rust products that emit a vapour in a storage cupboard or toolbox.

The vapour adheres to the metal and provides an imperceptible barrier reducing the likelihood of rust forming.

Control Moisture in the Storage Area

Rust requires moisture. Therefore, keeping air moisture levels to a minimum is beneficial. When looking at tools stored in a shed, workshop or garage, pay attention to air humidity levels. A small dehumidifier can easily maintain moisture levels.

Silica gel packets or other moisture absorbent products can be used inside drawers and boxes in more small spaces. Just make sure to replace the packets regularly to keep them working. Never leave tools sitting directly on bare concrete floors, as humidity will rise from the concrete and settle on tools, causing rust.

Also consider temperature fluctuations. A space that is cold at night and warm during the day generates condensation on the metal you are trying to protect. If you cannot maintain controlled space then this is going to cause problems with rust prevention so try to store your tools where temperatures remain as constant as possible. Even raising the toolbox slightly off the floor and/or keeping it in an inner room could help.

Select the right storage system

A good storage system is equally important as any coating or treatment you apply. Close cabinets or boxes with suitable seals, inhibit moisture entering. If the storage case or box has a rubber sealing, keep it in good condition to ensure it seals properly. Do not stack tools on top of each other. When metal contacts metal, it captures small pockets moisture, which accelerates rust. Use drawer liners, soft cloths, or other material to separate tools and keep heavy items on the bottom so that lighter tools do not bend/scratch.

Do regular checks and take immediate action when needed

Even if you take all these measures, rust will still attempt to gain a foothold. Check your tools regularly, especially after damp/snowy weather or if tools are stored in an unheated area. If you see the first signs of rust, immediately remove the rusted area prior it spreading. Lastly, check the storage area to ensure it is not generating condensation, or if it has damp patches. These conditions need to be improved by ventilation, or other moisture controls.

Plan out for Long term storage

If putting tools away for an anticipated long period of time, thus need to be treated with extra care. Clean them, and dry them well. Apply thin coat of protection, and use containment for moisture control. Some people like to temper the insides of the large chest slightly via low-wattage heater to avoid cold metal condensation. If renting a self-storage unit, pick unit that is dry and climate controlled as much as possible!