Which part of the "Tail" are you refering to thd stab or fin? I assume you are refering to the Stab,
if so you should be able to wick some CA into the joint, but make sure it's where you want to be, or
you will have some major surgery to follow to. Somthing else that can be done is remove a small
portion of the covering from the bottom of the fuselage near the tail feathers and cut a small hole to
get some epoxy from below onto stab, recover and it won't be as noticeable.