There are a variety of reinforcements involved here, and I've done them over a wide period of time (5/3/2007, 6/6/2007, 10/24/2007, 20/18/2007, and 10/29/2007) but they're all done now. In some cases I used plastic to hole the plies in place. I also tried aluminum foil, which some builders seem fond of. Not my favorite - I'll stick to plastic. It worked, but it was a bit touchy to remove in some spots.