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.
Posters printed on hard plastic or similar materials will obviously not need to be prepped this way.
Damage free adhesive picture hangers come in a range of styles and sizes.
Take down any other posters.
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.
Press the adhesive side of the hook to the wall for 30 seconds.
Hold for 30 seconds and release.
How to hang posters on painted concrete walls method 1 of 3.
Remove the paper lining on the back of the hook line it up straight and press the hook firmly onto the wall.
Clear the space where you want to hang up your posters.
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.
The installation process is fast which means you it will be up and ready to hold your frames in little to no time.
Get hardwall hangers capable of resisting up to 25 pounds or 11 kg.
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.