I have been repairing gun stocks for over 10years.
Hairline cracks are easily repaired with thin super glue.
It will literally seep completely across one side of a stock to the other where you would never get any epoxy to run to. It will also sometimes seep into a crack you never knew was there. Or you will be seeping it into a crack and be astonished that the crack was much longer than you thought because you can see the hairline getting damp. Small hairline cracks can be fixed w/o creating a overflow mess by dripping some thin super glue in a cap of some sort and dipping a toothpick in the glue and dabbing it into the crack. If you are on bare wood simply sand over the top before it dries after wicking and the fix is invisible from the sanding dust sticking into the damp glue. I do use epoxy anywhere I can get the 2 parts seperated enough. And I also use gap filling super glue in some places.
