The stock has what appears to be water marks on the stock where you would grip the shotgun and in a similar way on the forend where you would grip it for shooting. I remember hunting once with gloves on that had some kind of gripper type plastic (?) nubs on the fingers and palms during a rainstorm. These marks showed up after that outing, and despite many coats of oil nothing seems to penetrate the discoloration. I don't know what the actual finish is on the wood. Not hard and really glossy like polyurethane but something similar. Not simply oiled wood either.
If it would help I could post a pic, if my description doesn't work.
any suggestions are welcomed.
Joe