I have a large (est. 5'x7') sheet of plastic foam with a poster printed on it. It weighs maybe 3 lb and is reasonably stiff.
I'd like to hang it on a solid rectangular concrete pillar about 2' wide. The pillar is rough but flat and is covered with paint. Everything is indoors, in a large office building.
I'd avoid drilling concrete for such a light load.
One way would be using large amounts of 2-sided adhesive tape: 5'x2' contact area seems enough. Will such attachment last?
What are other options?
I used 10 Velcro-based adhesive 3M stripes (2 packs of 5 stripes, ~$10 total) which stuck to the concrete quite well, and made mounting/adjusting the poster rather easy. Multiple points of contact hopefully provide some redundancy for the case of any one strip unsticking.