@Mark Boyce posted:Bob, this stuff is weird. It real old. It has a thin layer of wood on each side, but the middle is some fibrous material. I think that’s the weak link. I need to find some new 1/4” stuff. I‘be had s pretty good run with old stuff, but Poor man’s layout materials don’t always work out! 😉
post a picture of the stuff. I'm curious now. Home Depot sells 2X2 pieces of various ply's. Pretty cheap and easier than dealing with a full sheet.