The best thing i found to hang about anything which isnt too heavy on a concrete wall is blu tack or any other type of sticky putty.
Hanging posters on concrete walls.
They are designed to work well with concrete or brick walls and hanging pictures on them is easy and quick.
This will make your posters easier to work with since the edges won t be curling back up as much.
Posters printed on hard plastic or similar materials will obviously not need to be prepped this way.
If the concrete block wall is painted and has a relatively smooth not porous finish hanging pictures may be as simple as installing removable adhesive wall hooks.
Damage free adhesive picture hangers come in a range of styles and sizes.
Remove the paper lining on the back of the hook line it up straight and press the hook firmly onto the wall.
Hold for 30 seconds and release.
Lay the poster or posters flat printed side up on a clean surface weigh them down at the corners for a few hours or a day.
Get hardwall hangers capable of resisting up to 25 pounds or 11 kg.
Take down any other posters.
If your wall is white maybe consider white putty because sometimes it leaves marks if you keep it for too long like a year or so.
Press the adhesive side of the hook to the wall for 30 seconds.
How to hang posters on painted concrete walls method 1 of 3.