FYI.....I recently attempted to repair holes in the S&W presentation case plastic inserts. I used a fiberglass kit and it was a mess. I had the glass fibers sticking to the insert, work bench, and my hands/face/arms. When finished I looked like I had been arm wrestling with a porcupine or perhaps a goalie for a dart team. On another one insert, I decided to forgo the fiberglass mat/cloth and had a roll of "rollable gauze" handy, so I used it with the fiberglass resin. What a difference, the resin permeates the gauze quickly and totally. the gauze is flexible and can be shaped to where adheres cleanly to the liner.