I used to glue posterboard to all of the stuff that I tooled and I was always getting the rubber cement all over, and I just think its messy but after reading on here about people using shipping tape on the back i tried that and it works great, so far all of the pieces that i have used it on have not stretched at all and i've tied it on everything from basket weaves to those huge tripoints and no stretch, i found that if you put it on one direction and then put another layer on the other direction then it works pretty good, the only problem I had was it was slippery on my board so I just put some masking tape on it and it quit sliding around. Of course the one drawback was it fuzzes up the back a little bit but not so bad that it looks bad on the stuff I do. Good luck hope this helps.
Bryan