I have had the same problem with my last covering job with monocote, never again. I will be going to silk for my upcoming gliders, and will go with koverall or full sheet and f/g for my gassers. I have used mono for many years, but this last lot is nothing like my older supplies [:'(] it tore so easily taking the backing of I got suspicious straight away, and I hacve now ripped it all of and contemplating what to use now, the plane in question is a scratch designed and built Zero, .60 sized with a 5'4 ws, built up wing, and open structure fuse and empanage