Yeah if repeated wipe downs or sailer wax doesn't work, get a cooler, and use the humidor for a dry box or at least, dryer box.
edit to add: I just thought of something. What type of Humidor is it? I use two trems to describe the most popular types of Box construction. One is Laminated Cedar, where a thin layer of a hardwood is laminated onto a body of cedar. The other is what I call a box in a box which is an outer box made of real pieces of a solid hardwood, and then pieces of cedar are added to form the inner box, bottom, side walls. These are typically just pressed in, with no glue, allowing the cedar to expand and contract with the moisture levels, Two makers who have used this was the old Hillsdale House, and then Reed and Barton who made Humidors for diamond crown. This type can often have the seal improved by very carefully removing the cedar side panels. Then lift out the cedar bottom. Place a sheet or two of Cedar sheet that is used in cigar boxes to separate the layers of cigars. Place the bottom cedar panel over the Cedar "shims" add back the side panels. Now the cedar side panels and the lips that they form are up higher than they previously were. I have had a lot of success with this method.