Before you begin storing any cigars, you must season a new humidor. This is also true for an old humidor that hasn’t been used in a while. To season a humidor, you will need two essential items: distilled water and a sponge or cloth. Use only distilled water, as minerals contained in tap water will affect the wood of the humidor itself. Please make sure your clean sponge or cloth is unscented and free of soap. Also, try to avoid using a paper towel because it will leave paper fibers on the wood.
Start by generously dampening a clean sponge or cloth with distilled water. Then, wipe down all exposed cedar wood inside of the humidor, including the interior lid, tray, and dividers. To prevent warping, carefully place the wet sponge or cloth on top of a plastic bag and place inside the humidor. The plastic bag will thus create a barrier so there is no direct contact with the wood.
Next, you need to prepare your humidification device. Once the humidification device is filled, be sure to wipe it down to remove all the excess water. With the humidification device and damp sponge inside, close the humidor and let it sit overnight. The next day, refresh the humidification device, check the sponge, and repeat the wipe down procedure using distilled water. Do not leave the sponge inside this time. Wait another 24 hours. After the second treatment, the walls of the humidor should have now absorbed all the water they need. It should be safe to use the humidor as long as you cannot feel any dampness on the cedar. If so, then wait an additional day before storing your cigars.