[livwire68]

gorilla glue can be a pain since it expands quite a bit, Its rather strong though and can be scraped off later. You should be able to find a non-toxic caulk. This would be the route I would go and let it air out until any odd smell is gone. Once it cures you really should not have any odd smell. Go around every joint and seam that is not a moving area. They typically use an adhesive when building a humi in the first place and after time any fumes dissipate. The glued joints in the humi now will tough to get apart without damage and then a through clean up afterwards. Just some thoughts.