CA on the edges of the FB is hard to do as the stuff is so watery and will easily run all over the place. On mine I masked off the line where rosewood meets maple and didn't even need to try and coat the edges as that sort of happened in one way or another. When sanding back and doing final polish I was more worried about the face of the FB as the edges were always going to be waxed after doing the whole of the back of the neck with 0000 steel wool to give it a very slippery satin finish. The wax was only used to seal those rosewood edges.