Well, I won't give any abuse, but I do not agree with the position of Mr. Rise. There are stocks that were not so well fitted when inletted that can benefit from unseen glass bedding, and older stocks that are a bit soft from oil soaking into the head can sometimes be salvaged by glass bedding. If well done, it is invisible from the exterior, and will be of benefit to the stock/metal joint, perhaps preventing damage to the stock from recoil.