Poster puddy, you can get it in the arts and craft section or next to the tape/glue and such...it's like a clay substance that you just take a piece of it and place it on the back of the poster and then push it against the wall lightly, and it should stay in place..it is slightly sticky, but it won't take off paint or ruin the wall in anyway..if there is some stuff left from the puddy on the wall, just rub a finger over it for a second and it'll come right off...^-^ hope that helps ^-^
But really, I used clear reusable mounting strips. I think they're made by scotch.... So far they have worked, and they claim to come off clean without taking paint off. I have yet to try removing it though.
i usally use blue tack, but only like the smallest dot for every corner then when you take it down dont rip it off pull it off slowly
without taking the paint off or putting a hole in the wall!
2 side tape ..., wait thts sticky ... ummm idk then
..........hmmm thats a good wuestion