Use industrial strength velcro (not the regular stuff). You can get it at Depot or Lowes. It is VERY sticky and holds for years. Changing to this from duct tape and staples was one of the best moves I ever did (duct tape wears down, even gorilla tape and staples cause tears to start easily). Get creative with the velcro. I've set it up so I can move reflective walls around to make areas smaller, larger, square or rectangular, etc (with panda plastic visqueen and mylar). Just leave the film or plastic piece in place and add sections of the opposite material in spots you want it on the walls/ceiling/floor. I usually put some strips at the bottom and top of my material so I can just roll walls up and attach it at the top, the wall is gone and out of the way while you work, then just roll down when it's time...as easy as it sounds.