If the crack is oil soaked, you have to draw the oil somehow...I let the stock head get warm in the direct sunlight or heat lamp and paint the whole head with a slurry of whiting and lacquer thinner a few times... allowing it to dry and brushing the dry stuff away between coats...after making the epoxy repair, I do some insurance work by adding a bowtie or two in much the same way that Remington inlets a barbell in the stock face of their 1894 SxSs...after that, it's probably sound advice that KY John gave to glass bed the action..
