One thing to keep your final finishing woes to a minimum:
Use a vinyl masking tape (we call it "yellow tape") to cover the areas on the stock's outer surfaces as close to the actual cracks as you can! Otherwise, the epoxy mess you are trying to "mash" into the fractures will penetrate the outer wood surfaces, preventing a good colouration match later. (Electrical tape will do, but it leaves far more sticky residue than the fairly expensive yaller tape.) Peel off whilst the epoxy is "about hard" but not "all the way hard".
I actually will wrap all of a stock I'm bedding or repairing with some sort of protective covering except at the work areas. Epoxy seems to end up in all sorts of odd places, especially if you're trying to beat a quick "cook off" time. Or maybe I'm just messy...