Steve, if you want to go the adhesive route, try some PVC pipe "adhesive". It's actually a nicely toxic solvent (tetrahydrofuran, THF) with PVC dissolved in it, that basically dissolves the target plastic a little bit and more welds it together than anything. (Same principle as model glue.) Kydex is a copolymer of acrylic and vinyl cholride, so it might work. Not a large investment if it doesn't.
That said, I've never seen a Kydex sheath "glued". Having some airholes to breathe will allow it to get rid of moisture.
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