I use HF beads and both of my wineadors have creeping humidity. I sealed the drain plugs and there does not seem to be any obvious leaks. I have accepted the fact that these things are just not 100% airtight combined with the Florida humidity. So every few months I have to take out all the beads and I put them on baking trays in the oven....250 degrees for about 30 mins always does the trick. It has just become routine maintenance for me.