If its just the tang into handle portion, to prevent water and what not getting onto te handle opening area, I have done the following:_
a) Fast drying glue... After applying it.. lest the knife vertical ( standing up).. it left some white deposits on the neck of knife from the glue fumes. IN addition... too thin a layer.
b) silicone: left a whitish blod and it peeled off ebentually as it does not bond well with te wood.
c) Epoxy: Takeda Style. Look for clear epoxy. I used the 4 minute drying time and thus hv to work fast. Piinch out abt half inch of each expoxy mix on a card board, mix it thoroughly with a toothpick, then scoop a blob of epoxy and apply to each side. When it is still wet.. touch up till you are satisfied and leave the knife upright. IF you do it carefully and hv a feel of it you dont need to tape up the handle and shld any accidental smearing on te main handle, clean it off before it sets.
IF you are not satisfied, you can remove it my cutting it off and try again!
Final analysis: Clear epovy adn te smallest tube wld suffice.
Good luck and hv fun.