We handle waste wet with oil and water, so you can not use it once the hole in rubber is opened. Can not you just thicken rubber at the tip of the fingertip? There is a # 40 rubber thick, but to wash the inside of the gloves used to flush the gloves and wash it but it is difficult to get back because the rubber is thick. And I do not need slip stops on the palm of the hand. Stubborn sticky and hard to wash. Without this nonslip jagged, I think that it may be # 40. I used it a lot, but for the moment # 50 is the best.