Why sealing the inside of a cedar humidor defeats the purpose

Cedar works because it is not sealed

Spanish cedar absorbs and releases moisture. That is the mechanism that keeps a humidor stable when the room swings. Lacquer the inside and you have a plastic box with a cedar smell.

The shortcut and its cost

Sealing makes cleaning easier and hides uneven grain, which is why it appears in cheaper cabinets. The consequence is a chamber that follows the room: humidity spikes with the monsoon and drops with air-conditioning.

Curing, not just species

Cedrela odorata needs air curing, typically six months, before fabrication. Green cedar moves after assembly and opens joints. Species on a purchase order does not tell you whether the timber was cured.

Keeping it stable

Unsealed interior faces, bi-directional humidity control and a sensor in the load space. No fragrance, no cedar oil, no sponge — those are symptoms of a chamber that is not being controlled.