If you use AcraGlas, as I suggested, use the four to one original resin, not the Gel. Heat the stock with a light bulb or heat gun, and apply the epoxy little by little, watching it soak into the crevice(s). When no more will go in, and you get a bead on the surface, lay a pice of clear packing tape over the wood and glass, and let it cure. The tape will hold the epoxy so it doesn't run, and will give you a raised bead to finish off down to the wood. The heated epoxy will flow like water. Cleanup wet epoxy with alcohol.