A leaking humidor can be caused by a number of issues. The most common is a leaking seal. By this, I mean the space between the lid (or whatever opening there is) and the reast of the humidor (the body). To check for a leak try the dollar bill test:

Put a dollar bill in between the lid and body. Close the lid Pull the dollar bill out Continue testing each corner of your humidor as well as the center of each side



If the dollar bill easily pulls out then there is too much space bewteen the lid and body. Thus, your humidor will leak humidity. Another (and better IMO) test is to put a flashlight inside the humidor, close the lid, and see if light shines through the seal. If light shines though you have a leaking humidor.

Dont worry yet. Dont toss that humi! It can usually be fixed.

The easiest fix is to go to Home Depot or whatever hardware store that is close by and buy some weather stripping tape. Line the rim of the humidor's body with the weather strip. This should create a snug seal.

Another common place for a humidor to leak is in the corners of the humi. A poorly constructed humidor may, over time, separate at the corner seals. The easiest solution is to simply use some wood glue in the gaps.

Does your glass-top humidor leak? If you have done the dollar bill test and the seal's corners are in good shape then the issue may be where the glass is laid in the wood. You can use clear waterproof sealant around the border of the glass to fix a leaking glass top. A thing to note about glass-top humidors: Yes, the look nice but glass is usually horrible as an insulator. Humidors are great because the are a barrier to the temp and humidity swings in the outside word. When you go from an all wood to a glass-top you give a bit of that barrier up.

Hope this helps as I know how aggravating a leaking humidor can be.